Why do people keep thinking he is going to have angel and demon forms? He's not one or the other, he's a Nephilim. Angel and Demon are the sum of his whole, not something he can just go into. Devil Trigger is pretty much just him using what demon magic his has as a Nephilim, tapping into the demon half of his heritage.
He can't just go "full demonic" or "full angelic" because he isn't 100% of either.
He can't just go "full demonic" or "full angelic" because he isn't 100% of either.