
Quick answer — Ryuunosuke Kamiki voices Taki Tachibana in Your Name., Kenji Koiso in Summer Wars, Shou in The Secret World of Arrietty and 4 more characters.
Ryuunosuke Kamiki voices Taki Tachibana (Your Name.), Kenji Koiso (Summer Wars), Shou (The Secret World of Arrietty), Charles Karino (The Princess and the Pilot), Peter (Mary and The Witch's Flower), Markl (Howl‘s Moving Castle), Tomoya Serizawa (Suzume).
Taki Tachibana is voiced in Japanese by Ryuunosuke Kamiki.