Yuuki Terumi

Terumi Yuki is the most prominent antagonist of Blazblue, and is also known as Hazama.

Background
Terumi was once one of the members of The Six Heroes, who fought against the Black Beast in the First War of Magic. He had also created the Azure Grimoire (which then created the Black Beast), he then wished to repay for his mistake, and killed the Black Beast alongside the heroes. However, he soon betrayed the Six Heroes, and murdered one of them, Nine, who was a fellow hero's wife