Lumineon's main body has a rounder appearance than that of its pre-evolution, Finneon. Instead of having a pair of tail fins resembling butterfly wings, Lumineon has pectoral fins that resemble butterfly wings, with a wavy patterning of dark blue on them. Lumineon has teardrop-shaped pelvic fins that can allow it to crawl along the sea floor. It has a tail fin that resembles the tail of Wynaut, being similar in shape and black in coloration, with a spot on it, however the spot is purple instead of white.