>>150059410
>>150059685
>>150063475
>>150064010
One problem with kid villains is that they eventually grow up, and they are understandably more likely to grow out of villainy unless they are the kid-version of an adult supervillain who is already established elsewhere.
People generally like and want to protect children, so it's hard to sell people on rooting against a kid over a long period of time outside of
1) bullies (which kids and the emotionally immature will dehumanize very quickly), and
2) extreme examples of power in malicious/selfish and immature hands.
Since in superhero comics a regular bully is going to get their shit kicked in, basically the only strategy left to achieve an intimidating kid villain is having the kid be extremely powerful (Joffrey in GoT has political power, Anthony from the "It's a Good Life" Twilight Zone episode has godlike power), which can make dealing with them very difficult/unbelievable for many heroes, because they need to be threatening from power alone and not strategy.
Ironically from that perspective, someone like Maka works as a villain to someone like Caroline. They're both ostensibly competing for recognition, but Maka can go, "I can steal all the effort you ever put into training instantly and beat the crap out of you because I'm super and you're not," and there's not shit Caroline can do about it besides call out for help and hope somebody stronger than Maka shows up to rescue her. If Maka enjoys being a bully, everyone else in the dojo is fucked.
And even then, when your whole narrative thrust is meant to be heroic and saving/protecting people, "saving the kid from a self-destructive, evil path" is a hard thing to exclude from that. Part of a kid villain's arc, if given long enough, can easily be redemption, because growing up and learning to be a better person is (ideally) an important part of childhood in general, and one an MC who is already a hero as a kid can't explore as well without regressing first.
