
Quick answer — Kousuke Oonishi voices Higuchi in Ron Kamonohashi’s Forbidden Deductions Season 2, Riron 3 in Tower of God, M-21 in Noblesse.
Kousuke Oonishi voices Higuchi (Ron Kamonohashi’s Forbidden Deductions Season 2), Riron 3 (Tower of God), M-21 (Noblesse).
Higuchi is voiced in Japanese by Kousuke Oonishi.