I've just learned about witch and familiar, and I would like to know what kind of familiar could a witch of blood or a witch of heart have ?

I’d like to think a Witch of Blood could be a relative, perhaps yourself for a Witch of Heart? Or a Splinter of yourself at the very least, some alternate version. That’s for more symbolical though I’m sure you could have like. A Bloody creature and some kind of Ghost if you wanna go more literal. I’m bad at coming up with Familiars.