He also must be seen as the bad guy all the time because of his powers. Sometimes even kwamis make jokes about how he always messes up, like the dinossaurs thing. Must be exausting be treated like that while your other half is adored by everyone. Of course he loves Tikki, but it's clear to everyone that people treat her better.
Plagg’s character gets a lot of different takes. The first time we meet him, he’s trashing Adrien’s room. He can come off as lazy, entitled, bit of a jerk. He can also seem very caring at times.
The consensus has been, “Well, yeah, he’s a cat.” And there is probably something to that.
But consider the power that the Miraculous gives over the Kwami. Look at how Gabriel treats Nooroo. Consider that, if someone of ill intent were to seek a Miraculous, the Black Cat is the one they would go after.
What if Plagg’s manners are a coping mechanism? What if this is his response to past abuse?
Adrien is truly exceptional to have won his trust after that.