
Quick answer — Yuuichi Oka worked on I Want to Eat Your Pancreas (Character Design), To Love Ru Darkness 2 Specials (Character Design), To LOVE-Ru Darkness OVA (Character Design) and 10 more anime.
Yuuichi Oka worked on I Want to Eat Your Pancreas (Character Design), To Love Ru Darkness 2 Specials (Character Design), To LOVE-Ru Darkness OVA (Character Design), Over Drive (Character Design), To Love Ru Darkness (Character Design), To Love Ru Darkness 2 (Character Design), Arms Alchemy (Key Animation), Motto To Love Ru (Character Design) and 5 more.