10 titles recommended if you like Helck
Rave Master
Black Clover
Dragon Quest: The Adventure of Dai
The Legend of the Legendary Heroes
xxxHOLiC
The Foolish Angel Dances with the Devil
The Demon Girl Next Door
Rozen Maiden
I May Be a Guild Receptionist, but I'll Solo Any Boss to Clock Out on Time
I'm Quitting Heroing