Definitely Tucker, mostly because Caboose isn't an original member.
Tucker: You know what? Forget what I said before. We can definitely pick up chicks in this thing. Probably two or three chicks a piece.
Church: Oh man, listen to you. What're you gonna do with two chicks?
Tucker: Church, women are like Voltron: The more you can hook up, the better it gets.
for real though, gotta be THE CHIEF, he's been with us from the start and he'll be with us till the end.