Quick answer — Shinichirou Ootsuka worked on Re:ZERO -Starting Life in Another World- Season 4 (Original Character Design), Re:ZERO -Starting Life in Another World- Season 2 Part 2 (Original Character Design), Re:ZERO -Starting Life in Another World- Season 3 (Original Character Design) and 13 more anime.
Shinichirou Ootsuka worked on Re:ZERO -Starting Life in Another World- Season 4 (Original Character Design), Re:ZERO -Starting Life in Another World- Season 2 Part 2 (Original Character Design), Re:ZERO -Starting Life in Another World- Season 3 (Original Character Design), Re:ZERO -Starting Life in Another World- Season 2 (Original Character Design), Re:ZERO -Starting Life in Another World- (Original Character Design), Re:ZERO -Starting Life in Another World- OVAs (Original Character Design), Isekai Quartet 3 (Original Character Design), Isekai Quartet The Movie: Another World (Original Character Design) and 8 more.