Richou

Richou is a Werecat Monk-Berserker from D.D.D. His Overskill is Artemis Fever.

Fallen Guardian arc
He appears in the Watermaple Consulate Raid Party's training grounds, where he has a  training match with Akatsuki, where she starts to use her small size as an advantage in combat.

Homesteading the Noosphere arc
Along with Kitsunesaru, Yuzuko, Rieze, and Kushi Yatama, Richou is among the five D.D.D members (or former member, in Kushi's case) that participated in the Shibuya Raid.

Trivia

 * Richou is one of the D.D.D members that comes from D.D.D Diaries.
 * In the light novel, he is with the Krusty army to finish the Return of the Goblin King event; however, in the anime he appears at the Watermaple Consulate Raid Party's training grounds.