@Mojack group
This can be a design choice to a personality, how you write them, etc. Anything goes.
I’ll start off with one of mine; one of my sonas, Gatzi. I personally like that they’re so flexible in terms of design. I’m someone who thinks of a lot of designs and in the early stages I had a lot of concepts for Gatzi in mind, but I couldn’t pick one so I made them a shapeshifter of some type. Now while they have forms they use more than others, I feel better now that I don’t have to limit myself to one form for them.