Genshin impact is incredibly popular, so obviously, some of the seiyuu (Japanese voice actresses and actors) in the game are playing it themselves, most notably Aoi Yuki and Rie Takahashi.
Why seiyuu are so important in Genshin Impact
Anime-stylized Gacha games like Genshin Impact, whose revenue is heavily dependent on characters, always hire extremely popular seiyuu. Huge names of the seiyuu industry and veterans like Rie Tanaka, Tetsuya Kakihara, Miyuki Sawashiro, and even T.M. Revolution have gotten hired by miHoYo. Genshin's developer typecasts 5-star characters and directly contacts a seiyuu's agency to offer them the job rather than going with auditions.
Moreover, it's important to realize most seiyuu are also otaku themselves. More often than not this is the reason why they became seiyuu in the first place. So they obviously play some of the games they do voice work on.
Aoi Yuki is mainly known outside Japan as the voice of Futaba in Persona 5, and Madoka Kaname in Puella Magi Madoka Magica, which is getting a new movie. In Genshin Impact, Aoi Yuki voices Hotaru (Lumine), the female Traveler.
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Genshin Impact voice actors Aoi Yuki (Lumine), Shun Horie (Aether), Yumiri Hanamori (Yanfei), Rie Takahashi (Hu Tao) play Windtrace together
On January 18, 2022, Aoi Yuki tweeted she's playing the Windtrace rerun Event with her seiyuu friends:
Aoi Yuki: "From left to right we have Yumirin, Rierii, myself, and Holy Yell (skip Gygax) playing the hide and seek rerun! There are new stages! We're all adults and yet we're acting like kids. Screaming stuff like "Uwaaa run away!!" "Gotcha!!" "I'm gonna catch you~". It feels like we went back to our childhoods and it was incredibly fun".
Aoi Yuki has been playing Genshin Impact since October 2020. Right after release on September 28, 2020. She regularly shares news of her Shota characters on Twitter and her impressions of the story. She highly praised the Inazuma Archon Story Quest.
Aoi Yuki already mentioned playing Windtrace with Shun Horie in May 2021. And how she picked the male traveler, Sora (Aether) in her account while he picked Hotaru (Lumine) in his playthrough.
More on Genshin Impact's seiyuu
Genshin Impact is currently in its Version 2.4. Yae Miko voiced by Ayane Sakura will release in 2.5. Kamisato Ayato voiced by Akira Ishida is rumored to release in Version 2.6.
The Genshin Impact seiyuu radio is also being published every Tuesday, with 8 episodes out now. I'll be publishing translations and summaries of each episode soon if time permits.