Quick answer — Ryousuke Sakamaki voices Lief in Deltora Quest, Yousuke Yamashita in Penguindrum, Nikolay Lobanov in Darker than Black: Gemini of the Meteor.
Ryousuke Sakamaki voices Lief (Deltora Quest), Yousuke Yamashita (Penguindrum), Nikolay Lobanov (Darker than Black: Gemini of the Meteor).
Lief is voiced in Japanese by Ryousuke Sakamaki.
