Iya'Su-White Mage

Somehwere in the story, Kume and the gang watch helplessley as th Ogecky corporation use a dark crystal, maybe a soulsphere to try and summon a dark creature but it turns out it was the wrong crystal and so Iya'Su is summoned. Kume and the gang then enter the fray to safe him and the Ogecky corporation escape. Because of his hazy memory, Iya'Su cannot remember where he was or how he got there. All he can remember was his dark pst when he was a Dark Knight, until he lost control of his powers, and so he reverted to be a White Mage. His weapon is his magic sword, and he still carries the crystal from which he was summoned on the front of his robes.

Hope you guys like it! ^^