Which characters do you imagine have beef with each other?

I’ll give you an example: Shaolin and Sohei. Both are monks whose prowess in combat is a reflection of their piety. I think Sohei would think Shaolin was arrogant, believing that skill will always falter to strength. Shaolin would just think Sohei is insane.

So which characters, given their backgrounds, fighting styles, etc, would just not like each other?

(Gryphon and Warmonger is too easy)

Additionally, you can say which two characters you think would be friends.