Marshtomp is a bipedal amphibious creature, mostly light-blue in colour with orange and black accentuation. Marshtomp has an angular black fin on his head small, orange eyes, and orange, pointed gills on the ends of both cheeks, similar to those on Mudkip. Marshtomp has fairly long arms with three-fingered hands. Marshtomp's underside is a lighter shade of blue, the coloration extending to above the circular patch of orange coloration on its belly. Marshtomp has legs with three small toes upon its feet, and two black fins as its tails.