Interesting! I consider him an extrovert because he panics when left alone and will choose a dangerous situation over that. He would rather go off and rescue the others even though he's afraid then stay safe where he is, and when offered the chance at least twice to stay in Xenon base, he chose to go into danger with the others.

He's nervous around strangers, but that could be due to the hostile environment he's always lived in--never trust anyone you don't know--though he does trust when people act kind, like Zee, Bar, and Pella. I note they're women, and probably women have hurt him less (juvenile detention wards, prison, reprogramming etc).

I don't think the crew ever counted as close friends. Vila likes being around them despite their insults however, but now I think of it, he's the one we know the least about, so he's good at lots of talk and little revealed. I still think his reaction to being alone is telling.