I'm sure this has been done before, but who knows how long ago. Anyway as the name would imply, just name your favourite character~
Mine is: Momiji Inubashiri.
She's part wolf (my favourite animal), a Tengu, Sword wielder (and a nice sword at that), has a great fanon design (however the original is ok too), and appears in my favourite stage in the series (I love the waterfall area with that autumn feel~)
My second favorite would be Chen. Third would be Sakuya Izayoi.