I recommend the two novels,"Save the NPC" and "The Heavens Begin from Transformation". Both of them are stories about the protagonist transmigrating to different worlds to complete missions. Among them,"Save the NPCs" was an infinite novel with quests such as "Dragons and Semi-Devils,""Naruto,""The Lord of the Rings," and so on."The Heavens Begins From Transformation" was a light novel and a derivative doujinshi novel with quests such as "Spiderman 3," Dragons and Semi-Devils,"and so on. I hope you like my recommendation. Muah ~