I’m kinda seeing Stanley as being quite similar to Gaston in the cocky/arrogant aspect, but…softer? If that makes sense. And definitely not in an asshole way like Gaston was towards the end. He does make an effort on his appearance, unlike most of the other townspeople, and has a bit of an “I’m better than you” vibe at some points. Most of which was probably brought on by how he (and many others) completely idolized Gaston. Like I feel as if Stan would be one of those guys who’s always like, “do it like a man!” But internally he’s always had a bit of a problem with it, but he just sorta pushed that aside. Until the wardrobe scene. After that he’d probably realize that gender roles are stupid, but he’d still slip up sometimes with the “like a man” comments. Even so, he’d still be a very confident, self-assured person. But, like I said before, not in the douchey way that Gaston was.
Yes, he’s sweet and kind and caring and gentle and all sorts of lovely things. But he also followed Gaston with enthusiasm that seems to surpass that of just a follower looking to earn the approval of their leader. When Gaston is gone, Stan would still be a bit conceited and over-confident, that’s just part of who he is. However, those things added to his other personality traits would make him quite a likeable person in my opinion