Would love to try the game.
I like Zhuo Fan from Magic Emperor. He would definitely be the equivalent of the heavenly demon or a rogue demonic cultivator. He would ask you to help him with a simple task and those very task would, without your knowledge, spell the doom for your sect or would make random factions hate you. The only way to clear his quest perfectly would be from learning what not to do the next time from doing multiple playthrough.
He would reward you with an ultimate that inflicts a whole lot of internal injuries when the quest is perfectly completed or a gift/ poison that makes anybody relation's climb to 100
