Between Tyler and Karin.
They're about to peacefully discuss who should be the protagonist and who the villain (and stop switching those places back and forth over and over again) Why? Because both have qualities to be in those places without much trouble.
Tyler: Violent, reactive, insane, and posses weird dark powers (that he can only use in his moments of tranquility), but still wants to recovers his sanity and live a calm life.
Karin: Also violent, impulsive, and tries to beat the s*** out of Tyler because she was told that he is an ancient demon that tormented her family (the worst part is that she believes it), yet seeks the best for her family.

I based this pic on a cover from JJBA (for the most part).