
Quick answer — Mitsutaka Itakura voices Kousuke Tsuda in The Girl Who Leapt Through Time, Katsuhiko Jinnouchi in Summer Wars, Inori Hakkai in NANBAKA and 1 more characters.
Mitsutaka Itakura voices Kousuke Tsuda (The Girl Who Leapt Through Time), Katsuhiko Jinnouchi (Summer Wars), Inori Hakkai (NANBAKA), Jackal (LUPIN THE 3rd PART 6).
Kousuke Tsuda is voiced in Japanese by Mitsutaka Itakura.