Dorohedoro, Gleipnir Recommendations
Dorohedoro and Gleinpir both follow protagonists who gain this weird feature about themselves that they wish to know more about.
Dorohedoro follows a powerful Kaiman and his mission is to find out who changed his head into a lizard, as well as the dude who is literally inside him. However, Gleinpir is slightly different, with Shuuichi being feeble, being controlled by Claire who has a leader mindset, being used to her will in this survival game they play.
Both are good anime with Dorohedoro being crazy and unpredictable, unlike Gleinpir containing bits of ecchi and supernatural.
Both the anime series makes us extreme terrified with its horrific Visual Effect and Character Design.