Cyno is speculated to be available in the game near future.
Cyno appeared in this Genshin official video.
You can see him in Genshin Offiial Manga as well.
Mondstadt Region Puzzles, Secrets, and Hidden Chests
How to make & link your MiHoYo account
The Great Mountain Survey Quest Guide
Top Mining Spots
How to Farm Artifacts
How to Get Rare Artifacts