Kraken Imagin is the main antagonist in episode 33 and 34 of 2007 TV series called Kamen Rider Den-O and he's an evil Imagin that was themed from a Kraken.
Wielding with a pistol, the Kraken Imagin is able to use it as well as his tentacles for weapons. The Kraken Imagins fulfill his contract with Piano Man for a piano. But, much to its dismay, his contract wasn't fully completed. The Kraken Imagin battled Den-O Sword Form, but the fight ended in a draw. The Kraken later succeeded in going back through time, where he fought Den-O Rod Form and was defeated by him. However, the Kraken Imagin turning into a massive flock of Heavens and a pack of Hells that destroy the entire district, negating the existence of those there, using all time trains to wipe them all, restoring everything within time and memory to normal, except for the original contract holder.