Kokomi is an average sized woman for someone her age, she stands at 5'4" and is ectomorphic. Kokomi's strength or physical athleticism is not her best trait, aside from swimming, of course. She has cotton pink hair with light blue tips at the ends of her hair. Kokomi's eyes are an ombre of purple to pink, kokomi has no pupils. She has gills behind her ears that help her breathe underwater, these gills are the same color as her hair.
Kokomi wears a light lavender bodysuit that ends with frilly shorts, on her chest is a big blue lavender brooch with white streaks running through it. She has big dark blue sleeves with light intricate designs on them. On the back, Kokomi's lower torso has a sort of light blue to lavender cape and splits to look like a fish fin. There is also a lavender blue thin ribbon bow on top of her waist cape and another salmon thin ribbon bow underneath it, in between the bow are two pieces of fabric shaped and colored like a clam. She has lavender booty shorts the same shade as her bodysuit, near the bellybutton is a crystal blue teardrop resting on the front of her shorts.
Kokomi wears dark lavender slipper-like shoes with purple-blue bows on the top, in the middle are white pearls. Kokomi also wears light lavender gloves that don't cover the back of her palms, she has a dark lavender purple-blue hair piece that go upwards and look like clam horns.