Thoughts on OCs?

I’ve never written an OC before, at least not a main character OC. I don’t really tend to read fics with main character OCs either except for specific circumstances. But recently I came up with an idea for a character that I cannot get out of my head. And now I want to do a full canon-compliant rewrite of the main series in this fandom from this OC’s perspective. I want to see how adding her into the story changes the established character dynamics and plot. I have a full character arc mapped out for her in my head already. I want to try drawing character art for her and I’m already getting more ideas for future fics involving her.

So I guess my question is, what do you think about OCs? Do you love reading fics with them in it or do you avoid them at all costs? What are some examples of OCs you’ve liked? What are characteristics you like or don’t like seeing in OCs?