duolingo
A language-learning app publicly released in June 2012, featuring multiple courses.
In July 2024, there was a collaboration between Duolingo and Genshin Impact, which had Duo (duolingo) and Klee (genshin impact) as friends.
Characters
- Duo (duolingo) (the service's main mascot)
- Lily (duolingo)
- Zari (Duolingo)
- Bea (Duolingo)
- Junior (Duolingo)
- Oscar (Duolingo)