Chikao Ōtsuka

Chikao Ōtsuka is a veteran voice actor in Japan, as well as the father of Akio Ōtsuka. He is most well known for acting as the voice of Dr. Ivo Robotnik/Eggman and Professor Gerald Robotnik in the Sonic the Hedgehog franchise, Dr. Weil in the Mega Man Zero series, and acting as both the voice actor and dubbing actor for various incarnations of Captain Hook in various adaptations of Peter Pan.

Role in the Metal Gear franchise
Chikao Ōtsuka acted as the voice for Big Boss in Metal Gear Solid 4: Guns of the Patriots. Similar to in real life, Big Boss also acted as the "father" of Akio Ōtsuka's character, Solid Snake. He was chosen for the role by Kojima as a means to thaw the ice between the estranged father and son.