Ross

Ross is actually the legendary hero Creashion. His real name was Shion and the name Creashion comes from his name and the name of his best friend, Crea, whose body was stolen by the first Demon Lord. The first Demon Lord is also Ross's father. Ross can't kill the first Demon Lord because he is in his friend's body. When Alba is sliced in half by one of the twelve great demonic beings, he uses his sealed magic to heal him. He sealed himself after some incidents with the first demon lord in another dimension. It takes one year for Ross and Alba to reunite, but for Ross it was just some hours since he was in another dimension where time flows different.