Megumu Koyama

Koyama anime


Personal Details
Status Alive
Race Human
Gender Male
Height Unknown
Weight Unknown
Esper? Yes
Professional Details
Affiliation Claw (formerly)
Rank Scar (formerly)
Esper Details
Specialisation Telekinetic Helix
Voice Actors
Seiyū Shinichiro Miki
Voice Actor Keith Silverstein[1]
First Appearance
Manga Debut Chapter 22
Anime Debut Episode 8

Megumu Koyama (誇山恵, Koyama Megumu) is an esper and a former member of Claw. He was part of the upper echelon called "Scar".


Koyama has a mohawk mirrored by a goatee, a diagonal scar across the centre of his face, a lip ring, three earrings in each ear, and a blatant lack of eyebrows.

As of chapter 100.7, Koyama now lacks his significant piercings and goatee, and having black hair instead. Unknown if it's dyed or his natural hair colour. Like Sakurai, he wears the uniform of the convenience store he is employed at, Smile Mart.


Koyama is prideful, reckless and easily frustrated. He has no qualms about using violence against kids and is a self-proclaimed "asshole", who will brutalize even opponents who willingly submit to him. It's possible that this is his ruthless way of making others learn to never do evil, at least in regards to commoners. He is prideful, and insists that he did not "lose" against Mob, even though he fled the scene rather than risking facing ???% Mob. He is willing to fight dirty, using cheap shots and knockout gas to try and defeat opponents that his sheer power can't overwhelm.

He showcases being naive from time to time, and often overlooks things or tries to avoid the scenario that's too difficult for him.

However later on his personality changes to reveal that he's willing enough to work with old enemies against a common opponent.

On chapter 100.7, it is revealed that he finally got his act together. He became a more honest worker, prioritizing his customer's satisfaction over the profits of the store, much to Sakurai's disapproval. Also, for the sake of protecting their jobs, Koyama is willing to fight against ???% Mob unlike before and working together with Sakurai instead of being hardheaded in fighting alone to prove his worth.


Koyama was assigned to capture Ritsu. When he got his hands on Ritsu, Mob intervened and beat him up severely. Before Mob could defeat him, he used Sakurai's cursed perfume to put him to sleep, then quickly escaped with Ritsu.[2] Later, he encountered Mob at the base of Claw's 7th Division and instigated a completely one-sided battle, which he almost immediately lost.[3]

Later, he decided to work together with Reigen and his allies to combat Claw's world domination plan.

Powers & Abilities

Koyama is a specialist of fighting in melee using his psychic powers, enhancing his blows using telekinesis to easily shatter psychic barriers.

Telekinetic Helix:[4] Koyama concentrates and revolves his psychic energy around his limbs and extremities to allow him to penetrate psychic barriers.[5]

  • Energy Bomb: A sub-technique of Telekinetic Helix, Koyama concentrates and revolves his psychic energy around his arm and then attacks with a strong lariat into the target's stomach.[6]

Notes & Trivia

  • He almost threw up when Shigeo made his and Sakurai's car fly, suggesting he may suffer from motion sickness.
  • Oddly enough, his name is an oxymoron to his personality (Megumu meaning 'kindness' to his 'asshole' behaviour, although this seemed to have changed recently).



  2. Mob Psycho 100 Manga — Vol. 4 Chapters 3033.
  3. Mob Psycho 100 Manga and Anime — Vol. 5 Chapter 38 (page 10-16) and Episode 9.
  4. Mob Psycho 100 Manga and Anime — Vol. 4 Chapter 32 (page 8) and Episode 8.
  5. Mob Psycho 100 Manga and Anime — Vol. 4 Chapter 32 (page 11) and Episode 8.
  6. Mob Psycho 100 Manga and Anime — Vol. 4 Chapter 33 (page 10) and Episode 8.