Thoughts about zenless OCS?

I'm gonna be honest here despite the hate I may get for it I ended up hyper focusing on zenless so much I started writing a fanfic based off an idea in my head, and I wanted to know what people thought about OCS being in fanfics.

I am trying to avoid the character being a marry sue, and it's also not a self insert.

Regardless I'm gonna keep writing but I was curious