
Quick answer — Souhei Horikane voices Heine in May I Ask for One Final Thing?, Sata in Inexpressive Kashiwada and Expressive Oota, Shou in I Got a Cheat Skill in Another World and Became Unrivaled in The Real World, Too and 2 more characters.
Souhei Horikane voices Heine (May I Ask for One Final Thing?), Sata (Inexpressive Kashiwada and Expressive Oota), Shou (I Got a Cheat Skill in Another World and Became Unrivaled in The Real World, Too), Haruto Kagari (Mebius Dust), Danshi Senpai (I Want to Love You Till Your Dying Day).
Heine is voiced in Japanese by Souhei Horikane.