Quick answer — Eiji Usatsuka worked on The Familiar of Zero F (Original Character Design), The Familiar of Zero: Knight of the Twin Moons (Original Character Design), The Familiar of Zero: "Rondo" of Princesses (Original Character Design) and 4 more anime.
Eiji Usatsuka worked on The Familiar of Zero F (Original Character Design), The Familiar of Zero: Knight of the Twin Moons (Original Character Design), The Familiar of Zero: "Rondo" of Princesses (Original Character Design), The Familiar of Zero (Original Character Design), In Another World With My Smartphone 2 (Original Character Design), In Another World With My Smartphone (Original Character Design), Ange Vierge (Original Character Design).
