Ol' buddy, Ol' pal

If you could have a partner Bakugan from any generation, game or unreleased, who would yours be and why?

My curiosity peaked reading posts about "Gateway Bakugan" (Bakugan that introduced a person to the game)

I would straight up have the original Percival or Haos Omega Leonidas (wii game version), I'd never be able to decide.