The Owl Imagin is an Imagin and the antagonist of episodes 13 and 14 of Kamen Rider Den-O.
Kamen Rider Den-O
The Owl Imagin made a contract with a man named Toyama, who wished for the park he worked at to become a better place for stray animals to live. Owl thus completes this wish by attacking any humans who try to enter the park and barricading the entrance to the park with cars and debris.
Owl later travels to the past where he fights Kamen Rider Den-O and is defeated by Den-O Gun Form. However, the Owl Imagin then reforms into Gigandeaths Heaven and Hades. Heaven is destroyed by DenLiner Ikazuchi's energy blast while the Hades Gigandeath is destroyed by combined firepower of DenLiner Ikazuchi and Gun Form's Wild Shot.
OOO, Den-O, All Riders: Let's Go Kamen Riders
The Owl Imagin was among the Imagin who allied with Shocker in the altered timeline where Shocker conquered the world. He was defeated by Den-O Climax Form.