Nagamasa Azai

Nagamasa Azai (浅井 長政) is the daimyo of the Azai clan and a playable character in Samurai Warriors 2. His family's ally is the Asakura clan. Through a political marriage with Oichi, he also became an ally of Nobunaga. His faithfulness to Oichi is sometimes mocked in the game and its companion title, Samurai Warriors 2: Empires. In Samurai Warriors, his age is 25 years old.

His design in both games was made to emphasize his youth and good looks. His first coat design represents his faithful yet flawed trust in his brother-in-law. In the second game, it was adorned with magpies to additionally represent his love for Oichi. His overall design remained the same in the sequel and is slightly modified to make him "Oichi's knight". The designers joke about the anachronism of his image but they think it helps enforce his role in the games.

Samurai Warriors
Nagamasa is the lord of Odani Castle and Oichi's faithful husband. In Samurai Warriors, he is a unique generic who has his own in-game cutscenes and quotes. He is supportive of his young wife and often apologizes for any grief he may cause her. In Oichi's true ending, he also appears regretful for betraying his brother.

In the second game, he is a devout believer in love and honor. He treasures Oichi and shows his love for her by giving her bell flowers. When he is forced to betray Nobunaga, he becomes conflicted between honoring his family's trust with the Asakura and his alliance with the Oda clan. In a dream, he sees the possible scenario where he successfully defeats Nobunaga and rules Japan. When he awakes, a soldier informs him that he is at Kanegasaki, moments before his pursuit of the fleeing Nobunaga.

Thanks to this dream, he decides to first fulfill his duty to the Asakura by capturing Nobunaga. When he is successful, Nagamasa stays true to his ties with the Oda clan and defeats the Asakura. After their victory, Oichi is worried about him betraying his ideals. Nagamasa assures her that he is fine as Oichi is the one he truly wants to protect.

His dream stage is a continuation of his story mode. Nagamasa becomes a trusted ally of Nobunaga and assists his final unification of Japan.

Warriors Orochi
In Warriors Orochi, Cao Pi battles him at Chen Cang. He defeated him and Cao Pi enlist Nagamasa, along with Oichi and Gan Ning to join him in overthrowing Orochi.

Kessen
He is the polite yet skillful youth who marries Oichi. He is dressed in the proper etiquette of the setting and has the traditional topknot hairstyle. Although allied with Nobunaga, he provides no military support and is first seen in battle as an enemy at Kanegasaki. When Odani Castle is engulfed in flames, both him and Oichi are still inside. Though they both planned to die together, Nagamasa entrusts his wife and daughter to return with Hideyoshi Hashiba. He is last seen walking into the castle's burning wreckage.

Quotes

 * "Faith shall lead the way forward!"
 * "In the name of all that is good and right!"