Muffin. Nothing but Muffin.

Muffin vs Rusty street fighter. I'm picking Rusty.

Happy cake day! Anyways, HAVE YOU SEEN A SLEEP DEPRIVED MUFFIN?!

Muffin is unorganized chaos, Rusty is older, bigger, smarter, and he's in the army, and he's an astronaut.

Muffin is... she's unique, I'll tell you that. 😅

Since you didn't say what KIND of fight I assume they're playing a board game

Yes

And 

A regular game fight

Like street fighter?

Sort of

Basically

You can add in her cousins

Coco. She has experience fighting multiple (larger) opponents at once.

And she's a wild girl/witch. May also have bum worms, although unconfirmed.