
Quick answer — Reo Tatsumori voices First Emperor in Tower of God, Daijin in Handyman Saitou in Another World, Dylan in Case File nº221: Kabukicho and 2 more characters.
Reo Tatsumori voices First Emperor (Tower of God), Daijin (Handyman Saitou in Another World), Dylan (Case File nº221: Kabukicho), Kururu (Drug Store in Another World - The Slow Life of a Cheat Pharmacist), Rikujou-bu Coach (Glasslip).
First Emperor is voiced in Japanese by Reo Tatsumori.