Kolossos is a big bloodstained bipedal hedgehog with dark blue fur, & sharp quills with big ears. He has tan skin on his snout, belly, arms & inner ears. He has bleeding black eyes & dilated glowing red pupils. His right arm has mutated into a large & long fleshy branch of spikes. He has a wide smile with no teeth. His normal left hand wears a cuffed white glove, & has bloody red claws as fingers. He also wears white socks & dark red shoes.