Yuuma Kuga is one of the main protagonists in the anime and manga series World Trigger. He is a mysterious transfer student who joins Border, an organization defending Earth against alien invaders called Neighbors. Despite his youthful appearance, Yuuma is actually a Neighbor himself and possesses advanced combat skills and a unique Black Trigger. Highly intelligent and observant, he quickly befriends Osamu Mikumo and helps him grow stronger. Yuuma's calm demeanor and hidden past make him a key figure in the series' ongoing conflicts.