Honda Tadakatsu is depicted as a huge robot. More specifically, his intro sequences are very much like launch sequences from the Gundam series although his method of getting around the battlefield is more akin to a Dom of the same series. Due to this, he gets a nickname among fans as "Hondam". Being a robot/Gundam, Tadakatsu cannot speak and talk but rather he makes mechanical sounds for his responses. This robotic appearance somewhat reflects his title of being the Strongest of the Sengoku.
Tadakatsu is a very loyal retainer of Tokugawa Ieyasu, and considered his "ace"/best fighter. He always appears to the aid of his lord. As such, he would always follow Ieyasu's orders. Whenever he appears in battles, as much as possible, he keeps true to his title defeating nearly every enemy he faces, or proving to be a great challenge to them. However, when the battle turns to the favor of the enemy, he is very much willing to sacrifice himself to protect/save his lord.
And he is not voiced, since that he is a large robot.