Seth

A young man shrouded in mystery, known as and feared by many. As though under the command of someone else, he challenges people who possess certain powers to duels, his identity and objective remains unknown.

A speed-type character, he specializes in closing the distance for quick, close-up attacks. "Captive Segment", a projectile that fires after some time passes, allows him to attack from both sides.

Trivia

 * Color 18: Yūki Kaji also voices Shoto Todoroki