Ishida Mitsunari is a character introduced in Sengoku BASARA 3. He is one of the main characters, alongside Tokugawa Ieyasu. He was a loyal retainer of Toyotomi Hideyoshi.
Mitsunari was a loyal retainer of Toyotomi Hideyoshi. However, when his former friend Ieyasu revolted and killed Hideyoshi, Mitsunari's heart became filled with hatred and he vowed to exterminate Ieyasu in revenge. Mitsunari gathered an army, including the likes of Sanada Yukimura and Otani Yoshitsugu. But in The Last Party, he wants to kill Date Masamune for killing his former master. He puts his hatred for Ieyasu behind his hatred for Masamune. In his blue path, he heard Masamune making fun of his master and he vows to kill Masamune for it.
Mitsunari fights using his odachi with an iaijutsu-style that delivers swift and gruesome death to any and all opposition.
And he is reprised by Troy Baker in the English dub and his Tomokazu Seki in the Japanese dub.