https://www.reddit.com/r/Genshin_Impact/comments/zsh4uy/lorewise_beautiful_characters/
Scaramouche - canonically described as beautiful in the HoOD artifact set
Xiao - described by Smiley Yanxiao as a good-looking fella, but not too tall (Moonchase Festival)
Xingqiu - Shimura Kanbei described Xingqiu as a “handsome young man” (Irodori Festival)
Childe - was called a pretty boy in his story quest
Mona - Ask-Me-For-Directions-Arnold simps for her beauty (GAA 2.8)
Diluc - One of Mondstadt’s finest bachelors. And also, Donna simps so hard for this man
Dottore - Implied to be Zandik, who’s described as “handsome” by Sohreh in her notes
edit. Forgot to add:
Yae Miko - described as having a beautiful appearance in her character page
Albedo - described by people as polite and graceful. Lisa also described him as “easy on the eyes.” Kaeya said that Albedo is “the type that everybody likes”
Barbara - literally the “shining idol” of Mondstadt. In her Character story 1, it was said that every citizen of Mondstadt adores Barbara