
Quick answer — H. P. Lovecraft worked on Nyaruko-san: Another Crawling Chaos F (Original Plan), Haiyore! Nyaruko-san: Yasashii Teki no Shitome-kata (Original Plan), Haiyoru! Nyaruani (Original Plan) and 1 more anime.
H. P. Lovecraft worked on Nyaruko-san: Another Crawling Chaos F (Original Plan), Haiyore! Nyaruko-san: Yasashii Teki no Shitome-kata (Original Plan), Haiyoru! Nyaruani (Original Plan), Haiyoru! Nyaruani: Remember My Mr. Lovecraft (Original Plan).