Best 5 Star?

Diluc (Pyro)
Venti (Anemo)
Ganyu (Cryo)
Jean (Anemo)
Zhongli (Geo)
Keep in mind that the tier lists and opinions on character strength may change with updates and new releases. It's always a good idea to check the latest community discussions, tier lists, and patch notes to stay informed about the current state of the game.