Touhou Project (東方Project) - Doomguy finds a new rabbit.

Then out of the sudden an Oni appears and attacks them and the first thougth that came upon Doomguy's mind is: "Rip and Tear".

Cock Shotgun

Doom theme plays

Implying he wouldn't simply adapt to the bullet hell nature of Touhou and manage to become a newly evolved rage-filled manifestation of it himself.

You KNOW he would.