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Do we have (or need) a subtrope of Mentor Mascot, where the Mentor Mascot used to be something else (a demon, a vampire hunter, a magic fox spirit) that was antagonistic to the main characters, but (even if begrudgingly) became an ally after being given a cutesy form, despite there being no immediately apparent reason (at least for the audience) that they should start helping the main cast? It's almost like being trapped in or reincarnated as a plush toy, a doll or a small pet obliges the previous antagonist to be suddenly helpful.
The examples are from Ghost Stories, Eerie Cuties (though in this case Blair's status as a vampire hunter isn't revealed until much later, and he starts out as friendly to the vampires from the audience's perspective) and Gunnerkrigg Court, respectively.