Kill him the same way he does anyone else. Because you and I both know they don’t buy neither the immortality nor the passives. Heck idk why we treat the immortality here like it’s instant. He survived Time Killer but he was on death’s door, we don’t know how, and it was far from immediate.
Since I’m on the subject, Blazblue’s chances of winning in DB are unfortunately not looking good. There’s the aforementioned Noel vs Aigis. If that even happens, Aigis is winning. Ragna probably loses to Velvet, Jin loses to Ky, Rachel loses to Remilia, Makoto gets bodied by Squirrel Girl, etc. The only ones with wins under their belt are Azrael, as he beats Garou (if that somehow ever happens) and Akuma, and Hakumen, and even that’s if they only use F/SN for the latter, which would be unfair af. Nine might have a witch battle. I don’t remember the opponent but I did remember that she got stomped in it. It might’ve been some Herald.