Serial Bomber

Serial Bomber (シリアルボンバー, Shiriarubonbā) was a former A-Class hero of the Hero Association, before he was ousted.

Appearance
Serial Bomber covers his face with a mask, only revealing his large nose and red tinted glasses. He wears his hair in a topknot that peaks through the mask.

Personality
He seemed to have no remorse on planting many bomb on a moving train, that could cause destruction to Z-City.

The Sisters Who Have Too Many Things Happening
Serial Bomber planted many bomb, hidden in a stall bathroom and tampered with the trains system. Genos tried stopping the train, while Fubuki was saving the passengers. The train failed to destroy the city, since Tatsumaki arrived and lifted the whole train in the air, immobilizing the explosion.

Abilities and Powers
While his exact rank was unknown, the fact he was an A-Class hero implies he is very powerful.

Miscellaneous Abilities
Bombing Expertise: Like his name would suggest, Serial Bomber is quite skilled with explosives, knowing how to create and set them.