Rottytops

Rottytops, as her name may suggest, is a zombie in the Shantae series. However, their zombies are a tad different.

Instead of being the zombies that moan "braaaaaaaaaaaaaains" constantly and get a burst of speed as soon as they see you, they're actually quite sentient (but still like brains). There's a reason behind this too, as explained in Shantae: Risky's Revenge - while these zombies can get to be the mindless, constantly chasing you type, a strong cup of coffee once in a while keeps them sane.

Rottytops is more or less a "frenemy" to Shantae - while she will help her out (she opened a labyrinth in the GBC original and helped to find a labyrinth in Risky's Revenge), she'd be more than happy to devour Shantae's brains - she made a bet with her in the original (you had to beat Rotty in a racing minigame), and she even helped Risky Boots out in the sequel because she thought she'd be getting Shantae's brains as payment. This zombie isn't above eating puppies, either.