
Quick answer — Hiiro Ishibashi voices Umi in Children of the Sea, Ayato Yorita in The Fragrant Flower Blooms With Dignity, Euini in Witch Hat Atelier and 3 more characters.
Hiiro Ishibashi voices Umi (Children of the Sea), Ayato Yorita (The Fragrant Flower Blooms With Dignity), Euini (Witch Hat Atelier), Morikawa (100 METERS), Kublai (Jaadugar: A Witch in Mongolia), Akatsuki Red (Mr. Villain's Day Off).
Umi is voiced in Japanese by Hiiro Ishibashi.