It is fascinating to look at Adrien and Felix’s respective behavior through the lens of/with full knowledge of their status as senti-beings and their respective parents’ supernatural control over them.
For one thing, Felix’s erratic, nonsensical behavior MAKES SENSE with that context!
Felix KNEW (presumably always, though we don’t technically know that) that his father controlled him through magic. He also understood that his father was an abusive a-hole. So he spent his life thinking about everything he wanted to do to express his pain and frustration. But since it wasn’t physically possible for him to actually make those choices, he never had to worry about the consequences.
Then his dad dies. Felix suddenly gains his free will. OF COURSE he has no impulse control! He’s never had the opportunity to develop any! So he’s doing every little weird, rude thing that runs through his mind, every scheme that he ever cooked up as a revenge fantasy. Just reveling in the ability to make choices and not thinking through the consequences. With his Mom being super supportive but frankly overly permissive because they survived an abuser together and she doesn’t have it in her to deny him any of his newfound freedom, even when he uses it to be a dick to people who don’t deserve it.
Adrien on the other hand, was manipulated more subtly, with significantly less understanding of the situation. There were a few things that he knew he wanted outside of his father’s plan for him, but he always expected any choices he made (with the exception of Cat Noir) to be something with would have to work with his dad to decide.
So when Adrien’s dad dies and he receives his amok, he’s NOT READY to think for himself. Everyone’s trying so hard to be sensitive and supportive and let him make his own choices, but he doesn’t know how. If choices were water, he’d be a desert child suddenly thrown in a lake without a single swimming lesson.
So yeah; Felix makes terrible, impulsive decisions until he experiences enough consequences to beat some forethought/impulse control into him. While Adrien freezes at having to pick his own outfit, until he spends enough time under his own control to actually develop opinions of his own on little things and not just the huge things (like being Cat Noir, dating Marinette, and staying with Natalie).
*to be clear, I’m not saying that Felix isn’t responsible for his actions. I’m just saying that a lot of his actions when he’s introduced were really weird, (cheese under the pillow?) which makes far more sense when you have the full context.