To be honest with you, there aren't that many characters that i like from the games.
Overall, they tend to be as shallow and one dimensional as possible, so i don't really
like them as much as i like their design.
There are a few exceptions though and a lot of them come from SwSh (such as Bede, Sonia, Hop, Marnie and Piers). I don't necessarily think it has the best story (if such thing even exist in a game where the story is nearly an afterthought), but i do like the characters' personalities and how they develop (aside from Leon).
I don't think so. Perhaps if N, Lillie, and Lusamine didn't exist, but since they're so far above normal Pokemon characters, if we take them out of the equation, I'd probably agree with you.
Which Lusamine? I personally think both are poorly written, but at least the first one was overall a more threatening villain. Both acted in a way that completely contradicted their motifs.
SM Lusamine created an Ultra beast killer even though she wanted nothing but to live amongst them. She harmed an UB to open a hole and spent so much time working on this overcomplicated plan, even though that was completely unnecessary and she could have just jumped into one of the wormholes that were already open, like the one that Nihilego came out of. I get that she is crazy because of Nihilego's juice or whatever, but even the craziest villains can make a little bit of sense in their own twisted way (like Joker for example). It also made no sense how anyone followed her orders. Like, what do they even get from helping her? I guess she could have payed them, but that was never said in the story and where is this money even coming from? After all, she works in a filantropic foundation that receives no money from helping pokémon (and at least in the games, i don't remember anyone mentioning any donor). Also, if their boss went to another dimension, there'd be no way for her to pay them anymore lmao
Meanwhile, USUM Lusamine was completely sidelined as a villain and the only real threat was Necrozma. She started off the game being crazy and abusive, just like SM Lusamine was, but then she suddenly turns into this overprotective mother after like 30 seconds of talking to her.
Regarding Lillie, i think she got a lot of focus to the point of your main character looking like a side character, but at the same time she was also very annoying constantly stopping you midway through your journey with useless shenanigans.
I do agree with you that N is not a bad character, although i don't exactly see what is so special about him. But i am open to discussions.