Sure, Gamzee Makara spaces out quite a bit, and his habits aren’t exactly the best, but his intelligence is actually surprisingly up there. When he’s not spacey, he has a good head on his shoulders..
Regarding that, he is also very accepting. No matter how many disagreements exist between him and whomever he may associate with, he will always figure out ways to look past them and still stay on a level with the other.
Loyal, accepting, willing to make sacrifices— he is the perfect friend.