Slugger

Orange hair sits above a build that is tall and noticeably thin. A blank white mask, patterned after the guard an umpire wears, keeps his face hidden entirely. His costume layers a pinstriped beige ballplayer's uniform over darker clothing underneath, trimmed with a belt, padding at the shoulders, and wide cuffs down at the shins, and below those cuffs come white socks to the knee and chunky shoes in orange and green. The piece that stands out is worn on the right arm: a gauntlet in gray, orange, and green, roughly double the width of the limb inside it, which most likely has something to do with his Quirk.

No scene has yet given him room to establish much. The only real read on him comes from the Sludge Villain Incident, where being unable to act on a hostage situation leaves him clenching a fist in frustration alongside the other professionals held back on the street.

He is one of the Heroes trying to bring down the Sludge Villain after it takes hold of Katsuki Bakugo, and the problem is that a target with no solid form gives him nothing to hit. Nobody present can do anything, so the professionals wait for someone whose Quirk suits the situation, and Slugger's frustration boils over.

Izuku Midoriya then breaks the standoff by running in to help Katsuki without a Quirk of his own. Slugger and the others try to pull him back, are ignored, and move to support him, but All Might reaches the villain first and settles it with a Detroit Smash. The Heroes are left cleaning up the street afterward.

His Quirk has never been named or shown. His hero title and his gear both point toward something baseball related, and an Ultimate Move called Nice Catch is recorded for him in supplementary game material.