Hijikata no doubt, but Okita is a very close second.
I love the both of the together.
Okita: "Hijikata-san, it's cold you need a scarf. here."
Hijikata: "Damn it Sogo! You're wrapping it around my neck!!"
Okita: "What are you talking about Hijikata-san? That's where a scarf goes."
Hijikata: "You're choking me with it dammit!!"
Okita: "Oh that's not good. You're still talking. You need to have it even more snug..."
Hijikata: "I'll haunt you Sogo......"
Okita: "Then I'll finally be Vice Captain. Haunt me all you want."
Hijikata: "You depraved sadist....."