Adrian doesn't care about your opinions. He talks back and is always on the look out to prove you wrong on everything ever. He's probably damaged, seeing as this is unacceptable behavior for a PCU, but his owner never really seemed to mind, in fact, it seems to compliment his own personality quite well, and so they carry on.
Hmm...I like his personality too, but it would seem like being around him would be exhausting since he'll want to be right every time. He sounds like a fun friend to have.