Isshin Yuiga

唯我 一心

The president of the school's Adventure Club. [Spoiler] Though he may look like a person with a noble cause, he is actually so manipulative, greedy, and treacherous that he will not hesitate to make his members to do the dirty work of uncovering the rumored "Nanana's Collection." [/Spoiler] [Spoiler] In the end, he realizes the mistakes he made when he uses the "Wizard's Cane" on Juugo, where it has a limitation that he was never aware of. [/Spoiler] (Source: Wikipedia)