Koenig

""Kehhhh-keh-keh-keh! Greetings from the great majin Koenig! When I defeat you, Leon, I will be a demon lord for all time. An ex-human like you, declaring himself to be a demon lord? Know your place, fiend! I’ll be happy to take yours once your body is firmly buried in the ground!""

Koenig (ケーニッヒ) was a majin that was in the service of Kleiman until around 65 years before Rimuru's incarnation into the world. He aspired to become a Demon Lord like his master and lost his life to Shizu while attacking the demon lord Leon Cromwell for his position.

Appearance
Koenig has an appearance that is a mix between a man and a bird with talons and a beak but a humanoid form. He's covered in green feathers across most of his body but has noticable blue and red feathers near and on his face. He wore a simplistic mix of hard leather armor and thick metal covering his waist, forearms, forelegs, and a singular shoulder.

Personality
Koenig was highly ambitious and overly confident in his abilities. His desire to become a demon lord lead to him being goated into attacking Leon Cromwell who was way out of his league. Despite this he is shown to respect his master Kleiman and his friends a great deal, coming off as a goofy but well meaning henchman.

Background
Koenig was a high ranking majin who served under the demon lord Kleiman upto around 65 years before the start of the series. He met his end at the hands of Shizu after attempting to kill the demon lord Leon and take his position on the demon lord council.

Trivia

 * Koenig is likely named after swedish car manufacturer.