Chibi Squad

Canon
All 5 of them have not interacted in the canon story line, however many people like to see them all as friends as they are all chibi characters. They all also seem to be around the same age. In official art, there is art of Klee and Qiqi together, Qiqi and Yaoyao together, Klee, Qiqi, and Diona together. Diona and Klee are the only two of them who have voice lines about each other.

Fanon
Many people like to ship them as friends due to them all being chibi characters.

Quotes
"Diona is the best! I like listening to her, last time I heard her say, 'I'm gonna destroy the wine industry in this city it it's the last thing I do!' And I'm gonna help her using my bombs! ...I don't know what a wine industry is though. Is it a monster?"

- Klee about Diona

"Every time Klee wants to play with me, I take her somewhere far from the tavern. Alcohol and explosives... yeah, that's a dangerous combination! I mean, do I want to destroy the wine industry of Mondstadt? Yes, but not in that sense!"

- Diona about Klee