Choose the character that you think sold the most in Genshin Impact
Characters range from the first Venti banner from v1.0 to the Kamisato Ayato/Venti Double Banner in v2.6.
This data is from April 2022 provided by Genshin Lab for Genshin iOS Revenue in the China Market

Note: the recent 5-star banner is Kamisato Ayato reran with Venti