Souji
He runs both the student council and the puzzle club, making him a pretty central figure at school. Most people respect him—even Kaito admits he's got serious skills, like the time he transformed some messy puzzle into an elegant one in seconds flat.
Souji used to be a Solver going by "Newton" back in his freshman year, but he never managed to snag the Phi Brain. The headmaster eventually brought him into the P.O.G., where he switched sides and became a Giver under the codename "Minotaur"—something eagle-eyed fans caught hints of all the way back in episode one.
His main focus now is looking after his underclassmen, particularly Kaito and his crew. He's made it a personal mission to guide them toward the Puzzle of God. Around campus he's usually all smiles, though notably less so when dealing with the headmaster. When he needs a break, he's the type to kick back with some boxed apple juice and a straw.
Content compiled by AnimeList.moe from publicly available sources.