Flamestrike
Legend
Jerks can be perfectly friendly and amicable also.Thing is, like most attempts to say "It's really this simple.", it doesn't come down to that. Good need not be nice, evil can be friendly and chummy.
Right up until they stab you in the back and take your naughty word.
And of course Good guys can be sullen, withdrawn and broody. See also: Batman and Jon Snow. At the end of the day though, they're still good guys.