MEM-cho

Stage Name: MEM-cho

Also Called: MEM

Real Name: Unknown (never revealed in the story)

Gender: Female

First Appearance: Chapter 20 (Oshi no Ko, Love Reality Show arc)

Age: 25 years old (publicly 18) at introduction → 27 (publicly 20) in later timeline

Height: 155 cm

Affiliation: Strawberry Production (outsourced idol work)

Group: B Komachi (idol member, later producer)

Family: Mother, two younger brothers

Image/Member Color: Yellow (same as her penlight color)

Occupation: YouTuber, TikTok creator, idol, later idol producer, VTuber

YouTube Subscribers: About 370,000

TikTok Followers: About 638,000

Voice Actor (Anime): Rumi Okubo

Live-Action Actor: Ano

Catchphrase/Claim: “I’m a pro at making things go viral.”

MEM-cho is introduced in the Love Reality Show arc as a popular YouTuber and influencer participating in the dating reality show “From Now On, It’s My Genuine Love” (“ImaGachi”).

After filming ends, she is scouted by Aqua Hoshino to join the revived idol group B Komachi, allowing her to pursue her long-abandoned dream of being an idol.

She becomes a core member of the cast, shifting from what was originally planned as a short-term guest role into one of the series’ central characters.

Author Aka Akasaka reportedly changed course after liking her expanded design and realizing she was exactly the type of talent B Komachi needed.

MEM-cho is short and cute, with short blonde hair that flips up at the back, pronounced fang-like teeth, and a signature black headband shaped like devil horns, which she wears almost all the time.

Her design is easy to stylize, and in both manga and anime she is frequently drawn in chibi or super-deformed form.

On the surface, she acts like a bubbly, slightly exaggerated “cutesy” type, leaning into a girlish, flirty online persona.

However, beneath that, she is extremely observant, cool-headed, and highly strategic when it comes to online trends, audience psychology, and self-promotion.

She calls herself a “pro at making things go viral”, and the story backs that up: she climbed to influencer status through carefully calculated marketing and content strategies.

At the same time, she is emotionally driven in her personal life and admits that she is “not actually that rational” when it comes to friends and feelings.

A key contrast in her personality is that she understands how toxic internet behavior works but still chooses empathy over pure efficiency.

One of her standout lines explains online dogpiling and apology culture:

“People flock to someone who is apologizing.

If you apologize, you’re admitting you did something wrong, right?

If you did something bad, people think it’s okay to throw stones.

So even though apologizing is morally correct by Japanese social logic, it’s the worst possible move as a crisis strategy.”

Despite this, she follows it up with her true nature:

“But I’m not that rational.

When I see a friend suffering, I just want to do something for them. That’s just how humans are.”

This tension between cynical media literacy and warm, human kindness is a big part of her charm.

In her childhood and teen years, MEM-cho was a dedicated fan of Ai Hoshino and dreamed of becoming an idol herself.

She auditioned for idol groups and actively chased that dream through high school.

In her third year of high school, her mother collapsed from illness.

Because they were a single-parent family, MEM-cho took a leave of absence from school to work and support the household, paying for her two younger brothers’ education.

Thanks to her efforts, her brothers were able to go to university and her mother’s health recovered.

By the time things stabilized, however, MEM-cho was already 23, past the typical cutoff age (around 20) for most idol auditions.

Encouraged again by her mother to chase her dream, she still couldn’t enter traditional idol routes due to age restrictions.

So she redirected her passion into streaming and short-form content, starting on platforms like TikTok and YouTube.

Because she was technically still enrolled in high school (on a leave of absence), she branded herself jokingly as a “current high school girl”, styling her image as a JK (high-school girl) creator.

Her “high school girl” persona unexpectedly blew up, gaining her far more popularity than she anticipated, and she found herself unable to step back from the lie.

Publicly, she claimed to be 18, even though she was already 25 during the Love Reality Show arc.

This seven-year age gap is described in-story as her age being “padded” or “embellished.”

Reality Show: “From Now On, It’s My Genuine Love”

MEM-cho first appears as a contestant on the dating reality show “From Now On, It’s My Genuine Love” (often shortened to ImaGachi).

There, she meets Aqua Hoshino and Akane Kurokawa, along with other participants.

She quickly takes on the role of a social glue character, reading the room, smoothing tensions, and boosting engagement for the show.

Her experience as an influencer allows her to analyze what will “trend” and how audiences will react to certain developments.

Through conversations with Aqua, she reveals her hidden backstory, including her real age and the sacrifices she made for her family.

Aqua, recognizing both her talent and her unrealized idol dream, suggests that she join the new B Komachi after the show concludes.

MEM-cho accepts, deciding to finally pursue the idol path she once gave up.

This decision marks a turning point, transforming her from just a reality show “character” into a central fixture of the main cast.

Joining B Komachi

After the reality show ends, MEM-cho joins B Komachi as a new member alongside Ruby Hoshino and Kana Arima.

Her official relationship with Strawberry Production is defined as “outsourced idol work”, meaning she is not a standard full-time employee but works through a contracted arrangement.

As a member of B Komachi, she brings:

Her internet marketing expertise

Her contacts among producers and creators

Her understanding of trends, algorithms, and online audiences

Her singing ability is described as “better than Ruby, but still in the ‘charmingly bad’ category.”

Despite not being the strongest singer, her charisma, comedic timing, and online clout compensate and add variety to the group.

Internal Role in the Group

Within B Komachi, MEM-cho is:

The oldest member, with the most life experience

The most savvy about networks and publicity

A kind of big-sister figure emotionally (even if she sometimes wishes the younger girls would show more respect)

She invests herself deeply in the group’s success, using data-driven strategies to help promote B Komachi online.

At the same time, she acts as a mediator and emotional buffer, especially in the messy romantic tensions around Aqua.

There is a recurring gag and bit of quiet pathos that, although she is significantly older, Ruby and Kana do not use honorific speech toward her.

MEM-cho feels a bit conflicted about this, but keeps those feelings to herself, handling it with adult composure.

Highly perceptive:

She can read situations and people quickly, often understanding dynamics long before others do.

Cool-headed strategist:

From handling flame wars to maximizing reach, she treats online presence as a craft and knows exactly how to pull levers to get attention.

Secretly older:

Initially her age is written with a question mark in in-universe materials (“18?”), hinting something is off.

Her attitude in certain moments (like calling the others “brats” when she impulsively treats them to barbecue) betrays her more mature age.

Self-aware performer:

She can convincingly play a high school girl, to the point that mentally older characters like Aqua find her “empty” teen chatter exhausting.

At the same time, some hints suggest even she finds that forced “youthful” banter tiring and cringeworthy, but she pushes through as part of the act.

Emotionally warm:

She cares deeply for friends and is willing to throw away perfect PR strategies to protect or comfort them.

Aqua Hoshino

Aqua meets MEM-cho on the reality show “From Now On, It’s My Genuine Love.”

Among the cast, they talk the most and grow surprisingly close.

After hearing her story and realizing her circumstances, Aqua invites her to join B Komachi, giving her a second chance at an idol career.

MEM-cho is one of the very few characters who understands the love triangle swirling around Aqua, Kana Arima, and Akane Kurokawa.

Concerned about Aqua’s behavior toward Kana, MEM-cho once takes a bold step: after a recording ends, she brings underage Aqua back to her home to lecture him about his attitude.

When Aqua points out that this is legally risky for her, she panics briefly, showing she hadn’t fully thought through the implications.

After Aqua explains that getting closer to Kana with half-hearted intentions would only hurt Kana, MEM-cho decides to respect his choice and watch from the sidelines.

She supports Aqua and Akane’s relationship publicly (for example, liking all of Akane’s date photos on social media), but her knowledge of Kana’s feelings later puts her into an emotional conflict.

Ruby Hoshino

Ruby is MEM-cho’s groupmate in B Komachi and a fellow idol enthusiast.

The two hit it off quickly, bonding as idol otaku and sharing similar tastes.

MEM-cho genuinely likes Ruby’s personality and energy, and they often come across as close friends within the group.

Interestingly, Ruby’s mental age (considering her past life and the four-year gap between death and reincarnation) actually makes her older in spirit than MEM-cho, even though Ruby looks much younger.

Kana Arima

Kana Arima is another member of B Komachi and a former child acting prodigy.

After hearing about MEM-cho’s struggles with age restrictions and family responsibilities, Kana sympathizes strongly and supports her joining the group.

Kana trusts MEM-cho enough to confide in her about Aqua, especially regarding Aqua’s cold behavior and emotional distance.

MEM-cho, stuck between supporting Kana’s feelings and supporting Aqua and Akane’s relationship, often finds herself worrying about how to handle these tangled emotions.

Akane Kurokawa

Akane is a stage actress who co-stars with MEM-cho and Aqua on the reality dating show.

MEM-cho is the first to clearly state that Aqua’s ideal woman is Ai Hoshino, a key insight that pushes Akane to research Ai in depth and “become” her through method acting.

That performance becomes the trigger for Akane and Aqua’s romantic involvement.

Even after the show ends, MEM-cho continues to cheer them on as a couple, always liking Akane’s social media posts about their dates.

However, after learning about Kana’s feelings for Aqua, MEM-cho starts to feel torn between two friends she wants to support.

She becomes a kind of empathetic “audience stand-in,” reacting to the mess of Aqua’s love life with both humor and genuine concern.

Ai Hoshino

Ai Hoshino is MEM-cho’s original and long-standing idol “oshi” (her favorite).

MEM-cho likely became a fan when she was still in elementary school, and Ai’s work was the main inspiration behind MEM-cho’s dream of becoming an idol herself.

Even as she becomes an idol and influencer, MEM-cho maintains that fan mindset, now applying her passion and knowledge to supporting B Komachi.

In the extra content set after the main story (volume 16’s bonus manga), MEM-cho has transitioned from idol to producer.

Her label at that point is “self-proclaimed college student,” reflecting a new gag persona now that her age is out in the open.

By then, she has apparently:

Retired from active idol work, largely due to her age and because it no longer fits the group’s direction.

Become B Komachi’s producer, focusing on strategy, image, and promotion rather than performing.

The bonus manga is framed as a streaming clip from one of her “talk about my favorite idols” videos, intercut with online articles, message boards, and social media, showing the state of various characters after the main story.

Within that video, she reflects on themes central to Oshi no Ko, and ends with a line that captures both her fandom roots and the series’ tone:

“May happiness come to you and to the one you love as your favorite.”

Although technically her “current high school girl” persona wasn’t a complete lie (she still had student status on paper), it was clearly misleading.

Whether she ever intended to fully return to school is left ambiguous.

As she becomes more visible as an idol and performer, tabloids begin to sniff around about her age.

Faced with the risk of being exposed by a weekly magazine, she chooses to come clean herself via a stream, confessing to having misrepresented her age.

Afterward, she shifts to a new angle as an “age-unknown YouTuber”, launching content around the idea of becoming a “current college student” instead.

Her comment section reacts with everything from shock to amused support, including “advanced” viewers who joke that they’d be relieved if she turned out to be in her thirties.

This self-reinvention fits her pattern of turning potential PR disasters into fresh, engaging content.

MEM-cho was originally conceived as a minor, arc-limited character for the Love Reality Show storyline.

However, as writer Aka Akasaka and artist Mengo Yokoyari developed her design and personality, they grew increasingly fond of her.

Her line to Aqua about wanting to do “our version” of the reality show—viewed from their own perspective—became a turning point.

Akasaka realized that not only was she perfect for B Komachi, but she also fit beautifully into later arcs, leading to her promotion into a regular and then main character.

Over time, as the manga and anime gained popularity, MEM-cho’s own popularity skyrocketed as well.

This led to her unexpected VTuber debut, where she exists as an official virtual streamer on the anime’s website and YouTube channel.

On the official Oshi no Ko anime site and YouTube channel, MEM-cho appears as a VTuber personality.

She delivers regular video updates about anime news, events, and collaborations.

Even after the end of the first anime season, her VTuber broadcasts continued, featuring:

Updates on upcoming seasons and projects

Event announcements and recaps

Light talk segments that further flesh out her personality

This meta use of MEM-cho mirrors her in-universe identity as a YouTuber and influencer, blurring the line between character and real-world promotion in a playful way.

Monster Strike Collaboration

MEM-cho appears in the mobile game Monster Strike as part of the Oshi no Ko collaboration announced in July 2024 at the DREAMDAZE II event.

She is featured in two major forms.

“B Komachi MEM-cho” (Light Attribute, Premium 5-Star Gacha)

Rarity: 5-star, premium gacha

Attribute: Light

Type: Humanoid race, Blast-type, Reflection shot

Abilities:

Super Anti-Damage Wall

Super Anti-Warp

Friendship Boost M

Anti-Transfer Wall

Friendship Combo: Growth Sphere

Strike Shot – “Idols Are All About Individuality!”

Increases speed and power, and after stopping, boosts all allies’ power for a certain period depending on the number of hits.

16-turn cooldown.

Despite being “only” a collaboration 5-star, she is considered very strong and is excellent for easily farming 5-star-limited quests.

“Tropical Girl MEM-cho” (Water Attribute, 6-Star Drop/Reward)

This version features MEM-cho in a swimsuit as a water-attribute 6-star drop character.

Rarity: 6-star, drop/quest reward

Attribute: Water

Race: Humanoid

Type: Blast-type

Shot Type: Penetration with gauge

Base Abilities:

Anti-Gravity Barrier

Mine Sweeper

Friendship Boost

Gauge Ability: Anti-Block

Friendship Combo: Piercing Target Lock-On Shockwave 4 (Water)

Strike Shot – “Nice! Here’s Your Reward!”

Increases speed and power, then, after stopping, attacks a distant enemy with a water gun.

12-turn cooldown.

Luck Skill: Luck Critical.

She is particularly suited for tackling the high-difficulty quest Moral (a powerful boss in Monster Strike).

In addition, making her max luck (Luck 99) helps clear collaboration missions more efficiently, since high-luck characters increase quest rewards.

A playful detail: certain collaboration stages show a familiar character “buried” within the background of the quest, adding an extra wink to Oshi no Ko fans.

Voice actress Rumi Okubo had previously appeared in the animated film Monster Strike the Movie: Sora no Kanata as Judas, but MEM-cho marks her first playable role in the Monster Strike game itself.

47 Prefectures Collaboration

MEM-cho also participates in a 47 Prefectures collaboration tie-in project related to Oshi no Ko and its broader media presence.

This event connects the franchise and its characters with all regions of Japan, using local-themed promotions, visuals, and content, with MEM-cho serving as one of the featured faces due to her influencer persona.

Even before her official age reveal, in-universe materials sometimes wrote her age with a question mark (“18?”), hinting at the lie.

She occasionally slips up with older-sounding comments, such as comparing romance to “falling for a host” or calling the younger cast “brats” when treating them to an all-you-can-eat barbecue.

Fans joke that at least there was still time before she’d be tagged as “MEM-cho, 38 years old,” implying that she has about 13 years of cushion.

Within the story, she often acts as the reaction character whenever new revelations drop, especially around Aqua’s family drama with Taiki Himekawa or Aqua’s complicated relationships with multiple women.

Her VTuber incarnation helped boost her real-world popularity, aligning perfectly with her in-universe identity as a viral content creator.