Quick answer — Kuon Erisa voices Reimi Kuga in Train to the End of the World, Jemima in The Promised Neverland, Raika in ONIMAI: I'm Now Your Sister! and 1 more characters.
Kuon Erisa voices Reimi Kuga (Train to the End of the World), Jemima (The Promised Neverland), Raika (ONIMAI: I'm Now Your Sister!), Surahappa (My Isekai Life: I Gained a Second Character Class and Became the Strongest Sage in the World!).
Reimi Kuga is voiced in Japanese by Kuon Erisa.
