This is Tristan Talisman.

This is his weapon.

He's also is half demon half angel.

He's from our universe and gets teleported to Remant. On the first day out of rubys home he is killed but has a deal made. He can live, if he has a demon and Angel inhabit his body. He agrees. He earns two semblances from this, the power of regeneration of anything lost, or decomposition of anything.

He has a thing for yang but thinks that with his other side's she will reject him.