Mimizuku Owl is a talking horned owl that wears sunglasses and talks to the audience during the beginning of night time scenes.
The Birth of Arale
Main article: Volume 1: The Birth of Arale
He first appears in Is It a Girl? Is It a Boy!? where he is sitting on a tree branch outside of the Norimaki Residence next to a robotic bat announcing the beginning of nightfall in Penguin Village.
Dr. Mashirito's Ambition
Main article: Volume 6: Dr. Mashirito's Ambition
In the anime episode Chivil, Hell's Messenger, he appears at the beginning of the episode and brings up a chart showing the audience the difference between a horned owl and a normal owl.