I know he hasn't really been in the forest too long, but does anyone think that my character Neko is a Mary Sue?

He is from a story I wrote, and to be honest in the story I kinda intended for him to be a Mary Sue. He is from a group of very powerful warriors that fight to protect the world, and are the strongest creatures on Earth. I just really liked the idea that such a small, skinny cat that appeared weak and helpless had the power to take down anyone or anything that he fought.

But I know that the forest really doesn't like that. I mean, Neko has the power to take down a very strong buck, and I know that's Mary Sue. I looked at his personality, build, pretty much everything about him, and I found no flaws, which is okay for my story but not so much here.

That's just my opinion though... do you guys think he's Mary Sue?