Board Thread:BlazBlue: Centralfiction/@comment-27279375-20160416191229/@comment-8695373-20160416193040

They are two different persons. Terumi is the ghost, he wielded the Susano'o Unit before Alucards gave it to Hakumen, and he was at the First Area when Relius and Shuichiro created the Black Beast. His spirit form was damaged, but Terumi knew that this would happen, and asked Relius to make a "spare body" for him, which was placed on Ishana before the Beast appeared. That body was Kazuma Kval. It had a personality and a soul of its own, but actually was just a vessel for Terumi. They merged, but then Terumi was captured by Valkenhayn, and spent some time in the basement of Alucard Castle. In that time Kazuma became exactly like Terumi in personality, and then Nine went to take Terumi so he could help the Six Heroes.

She placed a special spell on Terumi, the Mind Eater, which practically turned Terumi into her slave. To escape this fate, Terumi separated himself from Kazuma, who pretended that he is Terumi and worked for the Six Heroes. After the Dark War Kazuma tricked Trinity into lifting the Mind Eater from Terumi, and he then killed both her and Nine, and when Terumi tried to kill Hakumen and Jubei his spirit form was dragged into the Boundary by Haku, and the Kazuma body disappeared.

Some time after Terumi killed Celica and kidnapped Saya, Relius finished another vessel for him, and that is Hazama. But because of the Mind Eater Terumi now can't merge with his vessels properly, so the Hazama body still has its own personality.

It is actually written on their pages, please go read them before asking such questions.