Ken Takeuchi has a voice credit as Mario in the Japanese-language version of Haven't You Heard? I'm Sakamoto.
Mario / Japanese
TV anime / 2016
Keita Suminoe / Japanese
TV anime / 2010
OVA / 2008
OVA / 2016
Kio Kaidou / Japanese
TV anime / 2005
Yusuke Takasaki / Japanese
TV anime / 2003
Ranmaru Miura / Japanese