The Rarest Look: Decoding Shigeo Kageyama's "Big Clean Up Arc" 1st Outfit

The "Big Clean Up Arc" 1st Outfit is one of the most niche and beloved costume appearances for Shigeo Kageyama, better known as Mob, in the entire Mob Psycho 100 series. As of December 2025, this specific look remains a rare gem, primarily appearing in a short, non-canon omake (extra chapter) of the original manga.

This deep dive explores the context of this elusive outfit, its subtle visual details, and the symbolic weight it carries—a testament to Mob’s journey toward embracing a normal life, even while wielding overwhelming psychic power. The outfit itself speaks volumes about Mob's diligent nature and his relationship with his master, Arataka Reigen, during one of their most mundane yet charming adventures.

Shigeo Kageyama: The Psychic's Profile and Biography

Shigeo Kageyama, the protagonist of the Mob Psycho 100 manga and anime created by ONE, is an eighth-grade student with immense, world-shaking psychic abilities. His life is a constant balancing act between maintaining his emotional control and navigating the challenges of adolescence.

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• Full Name: Shigeo Kageyama (影山 茂夫)
• Alias: Mob (モブ), White T-Poison (a nickname from the Body Improvement Club), Boss (by Dimple)
• Age: 14 (Series Start)
• Affiliation: Salt Middle School (Student), Spirits and Such Consultation Office (Apprentice), Body Improvement Club (Member)
• Family: Ritsu Kageyama (Younger Brother), Parents (Unnamed)
• Mentor: Arataka Reigen
• Key Abilities: Telekinesis, Psychic Energy Absorption/Transfer, Spiritual Awareness, Emotional Energy Control (The 'Meter')
• Goal: To become a better person, control his emotions, and confess his feelings to Tsubomi Takane.
• First Appearance (Manga): Chapter 1
• First Appearance (Anime): Episode 1

Mob's typical attire is the standard black and white Salt Middle School uniform. The rarity of the "Big Clean Up Arc" outfit is precisely because it deviates from this iconic, everyday look, offering a glimpse into Mob’s off-duty life.

Unpacking the "Big Clean Up Arc": Context and Significance

The "Big Clean Up Arc" is not a major narrative storyline but rather a charming, self-contained omake (extra chapter) found at the conclusion of Chapter 51 of the *Mob Psycho 100* manga. These short chapters are often used by the creator, ONE, to provide humorous, slice-of-life moments that reinforce the core character dynamics without advancing the main plot.

The Arc’s Premise: Mundane Tasks and Master-Apprentice Bonds

Unlike the epic battles against Claw, the Mogami Keiji Arc, or the Divine Tree, the "Big Clean Up Arc" focuses on a simple, relatable task: cleaning. The arc features Shigeo Kageyama and his master, Arataka Reigen, undertaking a large cleaning job, presumably for the Spirits and Such Consultation Office or a client's property. This mundane setting is key to the outfit's significance.

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• Focus on Normalcy: The arc highlights Mob's commitment to his normal life and his apprenticeship, despite his powers. He is diligently doing manual labor, not using his psychic abilities for an easy out.
• Reigen's Role: Reigen, the self-proclaimed "Greatest Psychic of the 21st Century," is often the one roping Mob into these tedious tasks, further cementing their unique, paternalistic relationship. The contrast between Reigen's typically sharp suit and Mob's simple work attire emphasizes their roles.
• Fan-Favorite Moment: Moments like this are cherished by fans because they showcase the wholesome, down-to-earth side of the characters, which is the heart of the series' appeal. The outfit is a visual marker of this domestic, non-supernatural side of Mob's life.

The Elusive "1st Outfit": A Detailed Visual and Symbolic Breakdown

The outfit in question—the "1st Outfit" of the Big Clean Up Arc—is a rare and often-cosplayed look that symbolizes Mob’s diligence and humility. While there may not be a "2nd outfit" within this short omake, the "1st" likely refers to his initial, recognizable cleaning attire before any potential mishaps or changes in the chapter.

Visual Description: The Humility of the Cleaning Uniform

In the original manga panels, Shigeo Kageyama's "Big Clean Up Arc" 1st Outfit is a simple, unassuming work ensemble, a stark contrast to his iconic school uniform or his powerful 100% forms. The visual details are as follows:

• Base Layer: Mob is typically seen wearing a simple, dark-colored (likely black or navy blue) short-sleeved t-shirt or a non-descript plain shirt, sometimes over his standard white undershirt. This immediately sets it apart from the Salt Middle School uniform he wears daily.
• The Apron: The most distinguishing feature is a simple, no-frills apron. This is usually a light color, such as white or light blue, tied around his waist. The apron is a visual gag, symbolizing the menial labor Reigen has assigned him.
• Headwear (Optional but Common): In some depictions of the "clean up" theme, Mob is shown wearing a simple cloth or bandanna to keep his hair back, a common accessory for manual work.
• Gloves: He is often depicted wearing simple work gloves, further emphasizing the non-psychic, manual nature of the task.
• Expression: Crucially, his face maintains his signature placid, slightly confused expression, even while engaged in hard labor. This emotional consistency is a hallmark of Mob's character.

Symbolic Weight: The Power of Mundanity

The "1st Outfit" is more than just a costume; it's a powerful symbolic entity in the Mob Psycho 100 universe. It underscores several of the series' core themes:

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1. The Pursuit of the Ordinary: Mob’s greatest desire is to be a normal person. By wearing an ordinary cleaning outfit and engaging in a normal task, he is actively pursuing this goal, proving that he values hard work over his psychic shortcuts.
2. Humility and Diligence: The simple, unglamorous nature of the apron and work clothes highlights Mob's deep humility. Despite being the most powerful psychic on Earth, he is willing to do the most mundane jobs for his master, Reigen Arataka, without complaint. This diligence is what the Body Improvement Club tries to instill in him.
3. A Break from the Psychic World: This outfit is a visual representation of Mob taking a break from the intense psychic conflicts involving villains like Teruki Hanazawa (early on) or the members of Claw. It's a moment of peace and domesticity.

The "Big Clean Up Arc" 1st Outfit is a beloved piece of Mob Psycho 100 lore. It serves as a visual shorthand for Mob's commitment to his ordinary life, his unwavering loyalty to Arataka Reigen, and the series' overarching message that true strength lies not in overwhelming power, but in emotional maturity and the willingness to work hard at being a good person. For fans, it’s a treasured reminder of the series' heart: a powerful boy in a simple apron, just trying to clean up his life.