Katsuya Serizawa

Katsuya Serizawa (芹沢克也, Serizawa Katsuya) is an extremely powerful Esper, was formerly a part of the Ultimate 5 and member of Claw. He now works at Spirits and Such Consultation Office.

Appearance
Serizawa is a man of magnum height and build. Whilst still a member of Claw, he had curly black hair, somewhat heavy eyebrows, a thin mustache, and stubble. He wore an orange robe over a black shirt, along with black pants, and bright green crocs. He carried his white umbrella with him at all times. After the fall of Claw, he no longer carries his umbrella.

After being invited to work with Reigen and Shigeo at the agency, Reigen trims Serizawa's hair and shaves his face. When working at the agency he wears a two-piece business suit.

Personality
Serizawa was a very sheltered and naive person prior to leaving Claw. He placed all his trust in Toichiro Suzuki and looked up to him as a personal savior, following his orders without question. Before beginning his work at the Spirits and Such Consultation Office, If he was separated from his umbrella he would panic and completely lose control of his psychic power, which would cause heavy damage to his surroundings. He was haunted by a deep fear of his own power.

Serizawa is a very nervous person. Due to his years under Toichiro Suzuki, he seems to have difficulty acting on his own without guidance from others. However, after the fall of Claw, joining Reigen's agency and starting to attend night school, Serizawa begins coming out of his shell and becoming more independent.

Serizawa, before and during his time with the Spirits and Such Consultation Office, is shown to be caring of others' wellbeing, even going as far as keeping himself in his room for the sake of others' safety. Currently, he is more careful with his feelings and considers his thoughts more before giving advice or commentary. He's gained a little more confidence by working alongside Reigen and making friends with the people in his classes.

History
At age 12, Serizawa became so overwhelmed by fear of his own psychic powers that he refused to leave his bedroom for fear of hurting others. Lacking guidance from an adult understanding his problem and seemingly not helped by the non-esper counselors his mother had tried to hire, he remained in his bedroom for 15 years until Toichiro Suzuki finally coaxed him to leave (and by doing so, join Claw) by offering him an umbrella and encouraging him to view it as an extension of his room. Serizawa followed him, hoping to learn to control his powers and rejoin society. Instead, Suzuki used him to further the aims of Claw, leaving him and his well-being utterly dependent on both Suzuki and his umbrella. Serizawa believed Claw was a company, that Suzuki was its president, and that he himself was an employee.

World Domination Arc
When Joseph reveals his status as a double agent to Suzuki, Serizawa appears and lectures him about how lying isn't a very nice thing to do. Joseph tries to restrain him with his smoke but he breaks free and uses his powers to blast him out the window.

When Mob is climbing the stairs to confront Suzuki, he encounters Serizawa and tells him bluntly that he was being used. When he tried to argue in his own defense, Mob bluntly told him that he was following the wrong person. He made a token attempt to fight Mob, using his umbrella as both a weapon and a shield, but was eventually won over by the sincerity and empathy of Mob's 100% Friendship. By sharing his energy with Serizawa, Mob was also able to share his memories of true friendship with him, which helped Serizawa to understand the true nature of his relationship with Suzuki.

He later used his umbrella to save Reigen from Suzuki's wrath. Suzuki retaliated by blasting Serizawa with psychic energy until his umbrella was torn to shreds, then draining Serizawa's power to use for himself.

Serizawa is present at Toichiro's arrest. His former boss then tells him that he never really cared about him.

Divine Tree Arc
Serizawa decides to accept Reigen's offer and he start to work at Spirits and Such Consultation Office. At first Reigen decides to cut his hair and shave his beard.

He and Mob exorcize Yokai draw to the Divine Tree.

Telepathy Club Mini-Arc
Reigen invites Serizawa to the New Year's Eve meeting, but he already has plans with friends from school.

???% Arc
When ???% destroys the city, Serizawa and Reigen go check out what is happening. Serizawa is terrified by huge power of Mob, and he retreats.

Epilogue
He takes part and invites Sho to Reigen's birthday party.

Powers & Abilities
When he was a member of Claw, Toichiro Suzuki stated that Serizawa is the most powerful of the Ultimate 5. He is strong enough to block an attack from Suzuki at 3% of his power output as well as to put up a fight against Mob. His psychic aura takes on a purple color with a TV static pattern within.

Quotes

 * (To Mob) "Please... don't make me angry. Do you know how much your words hurt?"
 * "Ability... I can build... plastic models really well. Ah... What else..."
 * "How awesome is that... I talked to the prime minister."