He is a very loyal retainer of Tokugawa Ieyasu, and considered his "ace"/best fighter. He always appears to the aid of his lord (it is even reflected in Ieyasu's skillset in Sengoku BASARA 2 Heroes, where he calls upon Tadakatsu to ride on and attack). As such, he would always follow Ieyasu's orders (usually to attack the enemy). 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.