Quick answer — Rein Kuwashima worked on I Got a Cheat Skill in Another World and Became Unrivaled in The Real World, Too (Special) - The Legendary Dragon—Awakens (Original Character Design), I Got a Cheat Skill in Another World and Became Unrivaled in The Real World, Too (Original Character Design), Isekai de Cheat Skill wo Te ni Shita Ore wa, Genjitsu Sekai wo mo Musou Suru: Level Up wa Jinsei wo Kaeta 2nd Season (Original Character Design).
Rein Kuwashima worked on I Got a Cheat Skill in Another World and Became Unrivaled in The Real World, Too (Special) - The Legendary Dragon—Awakens (Original Character Design), I Got a Cheat Skill in Another World and Became Unrivaled in The Real World, Too (Original Character Design), Isekai de Cheat Skill wo Te ni Shita Ore wa, Genjitsu Sekai wo mo Musou Suru: Level Up wa Jinsei wo Kaeta 2nd Season (Original Character Design).