Souji Jikukawa
He is the president of the student council as well as the president of the puzzle club. Initially, he was a Solver with the title of ‘Newton’ but was unable to obtain the Phi Brain in his freshman year. The headmaster introduces him to the P.O.G., where he became known as a Giver under the name of ‘Minotaur’ which was first hinted in the first episode.
He is mostly seen smiling around others (except the headmaster) and likes to drink boxed apple juice with a straw.
But this turns out to be another disguise, as he is in fact a member of the P.O.G. Section Φ. It is revealed that he despises the direction of the new P.O.G., especially the new Chief of Headquarters, who just use the puzzles as a mean to commit murder.