I am at bit confused at the "does not really fit with the characters we want to add", with the spotted hyena standing there very prominently.
I am genuinely curious as to what lead to the process of picking one of the very few mammal species that have females with a (pseudo-)penis and are strongly associated with it, but then utterly ignore that fact when coming up with her character design.
Were you simply not aware of this fact or did a lot of time pass between choosing the characters' species and writing their lines?