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With a diaper bag at his side, Ida's younger brother, Mark Arbeiter, is always prepared for any trouble its littles find themselves in!

(Mark uses it/its and he/him pronouns.)

Also, just a lil side note: in my world, slimes typically take the appearance of their loved ones. When they find a lifelong partner, their appearance may change to match their partner more. In the case of Mark, it's taken on a fusion of its boyfriend's and its own appearance.