Quick answer — Keigo Sasaki worked on Umamusume: Cinderella Gray 2nd Cour (Character Design), Umamusume: Cinderella Gray (Character Design), ERASED (Character Design) and 16 more anime.
Keigo Sasaki worked on Umamusume: Cinderella Gray 2nd Cour (Character Design), Umamusume: Cinderella Gray (Character Design), ERASED (Character Design), The Millionaire Detective - Balance: UNLIMITED (Character Design), Lonely Castle in the Mirror (Character Design), Blue Exorcist (Character Design), Blue Exorcist: The Movie (Character Design), The Seven Deadly Sins (Character Design) and 11 more.