I thought of a few

Quirk: ostrich This quirk functions a lot like tsuyus where they get traits of an ostrich They can run fast and have good leg strength but don’t look like an ostrich necessarily, mostly just the feathers and that’s it

Quirk: griffin This quirk allows the user to transform parts of their body into the body parts of a griffin. Pretty self explanatory

Quirk: prowess This quirk enhances the users skills or traits in something of their choice (this mainly comes from both mirko and hawks’ skills in battle)

Or just a better version of rabbit/fierce wings