Battle Bunny Kalista
Those of you who have owned rabbits before know that carrots are actually not healthy for rabbits, but then I guess Battle Bunny Riven isn't meant to be accurate. Still, Battle Bunny Kalista can be.
Instead of spears through her chest, it would be celery stalks.
She'd be fully equipped to make sure her oathsworn gets some healthy veggies in their diet.
Bonus interactions: the voidspawn characters would say something along the lines of "Finally! FOOD!" When she spears them with celery. And the ghostly heads she sends out might be little ghostly rabbits hopping along.