Carl Clover is a young vigilante who dropped out of the Military Academy and a playable character in Calamity Trigger and Continuum Shift.
A talented young boy and first class vigilante, Carl has brought many criminals to justice with the aid of his mysterious doll Nirvana, which he believes to be his elder sister, Ada Clover. Carl heads to Kagutsuchi to retrieve the bounty for Ragna the Bloodedge. He is a former classmate of Noel, Jin, Makoto, and Tsubaki when they were in the Military Academy, but he dropped out. Carl wants to get revenge on his father Relius Clover, for what he did to Carl's older sister, Ada. In some part of his story, Carl meets Bang Shishigami, and Bang calls him his "cute little disciple".
Information courtesy http://blazblue.wikia.com/