Character: Jikukawa Souji 1u6b16

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 heaster 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. 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. To prevent this, he hacks into P.O.G.'s server once, to help Kaito and give him the necessary information to solve the puzzle and save Nonoha and himself.

Souji is very worried about the well-being of his underclassmen, especially Kaito and his friends, as he vows to himself to guide them to the Puzzle of God. He is well respected within the student body. Even Kaito acknowledges the fact that Souji was able to turn an ugly puzzle into a beautiful one within seconds. Being unable to figure him out, it is hinted that Kaito starts suspecting Souji of being involved with the P.O.G., as Souji was the one who gave him the pager, at the end the ninth episode.

He is mostly seen smiling around others (except the heaster) and likes to drink boxed apple juice with a straw.

Source: Wiki