It's totally okay if you make your OC a tad bit powerful. But just not too powerful where it goes mary sue level.
Don't make them too realistic or too fantastic. Just right there in the middle.
Example:
Too realistic (probably):
Normal hair,
Normal height,
Not so special powers
Normal cheery personality
Normal childhood
Just normal kid
Just right (I think):
Has normal hair color but wacky hairstyle (to fit with the personality, it's okay not)
Is powerful but not too much
Reckless
Had a lot of friends as a child
Happy-go-lucky
Short
I mean, it makes them kind of interesting when you put a fixed personality on them rather than just sticking on to normal stuff (which most of you probably misunderstood when I wrote the previous chapters)
Too Overpowered/Mary Sue (idk):
Has long beautiful rainbow shining hair that can extend into certain measures to trap their enemies.
Ultimate god-like power that is a secret and still has many more secret powers that they haven't revealed yet.
Is right at everything.
Note for everyone who compare their OCs to my examples:
Don't actually compare them to my examples. They are examples for a reason and I have no idea what you did with your OC. The tip I only have for everyone when balancing an OC is to think realistically and to go and compare your OCs with actual Mary Sues you happen to stumble online.
I see many ppl comparing their OCs with my examples in the comment section. I actually have a different view on what I have written down and ppl seem to misunderstand them a lot. That's why this book went back to it's developing stage.
I still accept all forms of criticism tho. They don't really affect me that much and the only thing I have to do is to think about it and edit this thing again.
Just a small reminder :>