>>14223891Kizuna Ai is one of the best for learning Japanese, she subs her stuff in both Japanese and English so you can try to listen first without looking at the subs and then listen again with subs.
I also recommend listening to vtubers who speak a lot of Japanese but aren't Japanese themselves. Alice Mana is one of them, she's Korean but most of the time she speaks really slow and clear Japanese. Petra Gurin is fluent in Japanese and usually translates what she says in Japanese to English, and she even did a few streams where she translated Japanese text to English (her ProSeka one and the Niji Shindan collab on Pomu's channel)
Other vtubers who speak fairly easy to understand Japanese for listening and learning the language are Nekomata Okayu, Shizuka Rin, Shellin Burgundy, Kanda Shoichi, and Hakui Koyori.