Teitoku Kakine

He is one of the seven Level 5 espers, ranking second after Accelerator and is the leader of SCHOOL, one of the many underground factions. His power is production of the Dark Matter, the substance which isn't supposed to exist in this world, which makes him the opposite of Accelerator who specializes in destruction. He shares a rivalry with Mugino Shizuri, team leader of ITEM and the number #4 Level 5 esper 'Meltdowner'. He strives to become the strongest, even if it means to kill off Accelerator. He's also a ruthless, cocky, and coldhearted individual who shows no mercy or compassion towards his enemies or bystanders, and won't hesitate to look down on anyone whom he deems inferior.

In the war between the underground factions of Academy City, Kakine fights Accelerator but loses. Yomikawa stopped Accelerator from killing Kakine but Kakine stabs her from behind, causing Accelerator to go berserk and kill Kakine in a gruesome way- going as far as tearing him into countless pieces. But later Kakine reappears in New Testament and features prominently in the sixth volume. It was revealed that he wasnt actually dead but his body was preserved by the Kiharas. He learns to copy human cells thanks to Kihara Byouri using his power in Baggage City, resulting in him becoming able to create even his own body.