Ok so I haven’t seen that show in over 20 years, so I’m going off of hazy memories here, but as much as I like the guy, I don’t think he was aligned good. He’s kinda stupid, and would get talked into doing some pretty heinous shit when Arthur wasn’t there to act as his voice of reason. I’d say he’s either True Neutral, or Chaotic Neutral. Arthur is Lawful Good
I don’t think being dumb or gullible precludes you from being good. His heart is in the right place. In a fictional world of super heroes and villains, I’m unsure if he’s operating within vigilante laws. I think he’s dumb enough to not know what they are and attempt to follow them. If he was willfully ignorant of the law it’d push him toward chaotic. So I’d say he’s definitely neutral.