The Shady kid who's responsible for the racket in episodes 8-9. He goes to Himeji High School with the Seiranger. He said he's "cool", bu really he's only an annoying geeky nerd. Because of this, he will cause again trouble....
When Kota-chan drank the Monster Potion, he became a monster and attacked the school. Even with big eyes, he still need his glasses to see...(hint)
When Kotamon drank the Zenith Grow potion, he became Kaijuu (Sea Monster, since he looks like a fish) Kota and enraged the school grounds. He is twice the size of DaiSeishin.