Tokugawa Ieyasu is a young man who believes in bonds and seeks to use their power to unite the whole territory of Japan, and in turn bring peace. He has made an appearance in all Sengoku BASARA titles to date, making his first playable debut in Sengoku BASARA 2 Heroes as a young child wielding a spear. Since Sengoku BASARA 3, Ieyasu has grown into a feisty yet respectful young man, opting instead for the use of his fists in battle.
Tokugawa Ieyasu is a character who had his first major role in Sengoku BASARA 3. In Sengoku BASARA 2 Heroes, Tokugawa Ieyasu along with his loyal general Honda Tadakatsu by his side, sought to conquer the land. However, due to him being a child he wasn't taken seriously by the other warlords. Ieyasu wound up fighting in Oda Nobunaga's army, as the Oda were intimidated by Tadakatsu's strength (but he reneges on the alliance and rebels against Oda. But he rebels and was apparently killed by Mitsuhide in the anime). After Nobunaga was killed by Akechi Mitsuhide and Mitsuhide was killed by Toyotomi Hideyoshi, the latter began conquering the land. Ieyasu surrendered to Hideyoshi and became one of his generals. Eventually, after seeing Hideyoshi's lust for power, Ieyasu rebels against him and kills him, sparking off the events of Sengoku BASARA 3.
Ieyasu is now a young man with great physique and fighting skills. He leads the Eastern Army against Ishida Mitsunari, who hates him because of his betrayal, which resulted in Hideyoshi's death. Ieyasu wishes to unite the country through his own means. Many of his paths are dedicated to seeking out allies to assist him in fighting the Western Army.
Ieyasu is often referred to by older generals by his childhood name "Takechiyo", even after his appearance is updated.
In the fourth game, Ieyasu is having conflicts with himself after leaving the Toyotomi to conquer the land himself. Despite leaving the army to pursue his goal to unite the country with the power of bonds, Ieyasu finds that he himself can't avoid the violence of war and begins wondering how he's any different from Toyotomi Hideyoshi or why he left in the first place.
In his drama route, Ieyasu runs into Keiji, who asks for Ieyasu to call him when he thinks of wanting to confront Hideyoshi himself. When Ieyasu finds out later on that Matsunaga Hisahide is having a battle with Hideyoshi under the Ashikaga forces, Ieyasu decides that he doesn't have the time to find Keiji and heads directly to the battlefield. Once he reaches there, he finds himself being questioned by both Takenaka Hanbei and Hideyoshi about his new ideals and his drive to oppose their doctrine of strength, with Ieyasu struggling to give them a straight answer. Keiji eventually reaches the battlefield himself, angered at Ieyasu for not telling him about opposing Hideyoshi and Hisahide. Hideyoshi eventually defeats Hisahide and is holding him in the air, but Hisahide causes a massive explosion that kills both him and Hideyoshi, leaving Keiji distraught and Ieyasu disturbed at what just unfolded.
Ieyasu heads to Sekigahara to tell Mitsunari the news of what has happened, but Ōtani Yoshitsugu has already wrongly reported to him that it was Ieyasu who killed Hideyoshi. Despite this, Mitsunari gives Ieyasu the benefit of a doubt when they meet and asks him personally if he killed his lord. Ieyasu, knowing that Matsunaga is dead and Mitsunari's reason for living died with him, lies and says that he did kill him, only because he was in the way of him conquering the country. This sends Mitsunari into an absolute rage and they do battle, with Ieyasu disarming him and flying off on Tadakatsu. His last words to himself as he's flying are "Hate me...and live on", referring to Mitsunari.
In The Last Party, he tried to recruit several factions in his Eastern Army, some accepted, some declined. He decided to go to Sekigahara to play with Kobayakawa Hideaki's trap.
And he is reprised by Liam O'Brien in the English dub and Toru Okawa in the Japanese dub.