Blast

Blast (ブラスト, Burasuto) is a S-Class, rank 1, superhero for the Hero Association. His whereabouts are currently unknown.

Appearance
He has yet to make an appearance.

Personality
Nothing is known of his personality, but as evidenced by Child Emperor's reactions, Blast has a tendency of not showing up to the Hero Association meetings.

Alien Conquerors Arc
Blast is mentioned during the S-class meeting.

Abilities & Powers
Being the highest ranked hero of the Hero Association, it can be presumed that Blast is a very powerful S-Class hero.

Fubuki mentions that Blast is "The top all heroes" during her talk with Saitama in his apartment putting Blast alongside King in power terms.