Alright, I need to address things about categories so you won't keep adding them where they don't need to go.
The "Non-playable characters" category is only for the NPCs in the Mario RPGs. And even if it wasn't, how in the world is Peach, who has been playable in countless of Mario games, is considered one? That category is strictly for those who aren't playable at all. I'm also working on revamping that category so please stop adding it onto pages.
Enemies vs. Bosses. Enemies are usually smaller, common foes that are encountered a lot in a game while bosses are bigger, usually pose a challenge, and have their own theme. And defeating them usually results in a reward. So, stop adding the "Enemies" category onto Boss-only pages. This includes pages like King Boo, any of the Koopalings, etc.
Linking categories to themselves. Don't do that. Like, this should've been common sense...
You've been doing this a lot and it seems like you're just adding categories for the sake of adding them. Not to sound rude but it's rather bothersome trying to revert your edits when it should've been common sense to not add a certain category onto a page. I'm giving you this warning now since it's fair to do so but if I keep seeing you add categories where they don't go, it could result in a block. I am working on a category policy but it's taking a while due to my work schedule but. However, like I said, this warning exists because you're adding categories where they obviously shouldn't go.
I see. I thought that the non playable characters category was for characters in general who are non playable so I added Peach as she is non playable in the Mario bros games. Regarding the enemies vs bosses I understand, it just either way they are antagonists so I thought that would make sense. For putting categories in themselves I did that as I have seen that on other wikis. Again I Apologize, I will avoid doing these mistakes again. Thank you for letting me know.