i'm really curious as to why the 'real' christian became a bastard

The shock I got when he acted like a dream guy with Marisa when she was a baby girl! I didn't expect the previous rich demon boy to be a charmer- maybe mother's death broke him?

It could be that or another one of those mixed match souls situation. Someone could have saw him as a threat and did some black magic or something on his ass¯_(ツ)_/¯ I mean like mc seemed to be pretty similar to christian when he was a kid