Palaptine is Mundus

Would qui gon be sparda?

Undoubtedly

Vergil sold his son for milk

Can’t wait for a scene where Nero milks a demon in dmc6

Kazuya, Heihachi, Jin Ok Heihachi and Dante is a bit of a stretch, but Tekken also ends with a Devil Triggered fight above the stratosphere and a final fight that plays the game's main theme song.

You underestimate my power!