Robb Stark
King in the North
I think by "Not Fade Away", they are. There's always going to be that underlying tension between them. There's too much history and too much Buffy for there not to be, but I think they're friends by the end, including "After the Fall". They seem to at the very least have a strong respect for one another.
In AtS S5 I kind of think of them as quarrelsome brothers, to a certain extent. That's helped by the obvious chemistry David Boreanaz and James Marsters have together as actors (come to think of it, who DOESN'T James Marsters have awesome chemistry with?). They just play off one another so well, and Spike's presence brings some really cool and interesting new dimensions to Angel's character. I thought having Spike there made Angel a better leading character from a narrative perspective (and he was already my favorite before that).
In AtS S5 I kind of think of them as quarrelsome brothers, to a certain extent. That's helped by the obvious chemistry David Boreanaz and James Marsters have together as actors (come to think of it, who DOESN'T James Marsters have awesome chemistry with?). They just play off one another so well, and Spike's presence brings some really cool and interesting new dimensions to Angel's character. I thought having Spike there made Angel a better leading character from a narrative perspective (and he was already my favorite before that).