I recommend "The Chosen One of the Otherworld" and "Top-grade Alchemist: Demon Emperor, No!" These two books are for you. " The Chosen One of the Otherworld " was about a large number of Chosen Ones chosen by the gods and bestowed with special abilities. The main characters were two of them. One was forced to undergo a transformation and embarked on an extremely dangerous path of spiritual transformation, while the other became a demon king from a soulless state. "Top-grade Alchemist: Demon Emperor, don't!" It was about a modern Chinese medicine doctor who transmigrated to the adopted daughter of a small family in a different world. As she grew up, she became the demon master of a Divine Shrine on the continent and assisted the female protagonist in her growth. These two books had two main characters and two main plots, and the theme was fantasy. I hope you like my recommendation.