Masayuki Sanada

Masayuki Sanada (真田昌幸) is the fourth head of the Sanada clan and Yukimura and Nobuyuki's father. He is a shrewd yet masterful strategist who is famous for stopping Hidetada Tokugawa's 38,000 men army with a mere 2,000 men at Ueda Castle.

Samurai Warriors
In both games, he's an elderly or middle aged general who orders Yukimura to assist him in halting the Tokugawa forces at Ueda. He traps Ieyasu and his men by luring them downstream from the castle and breaking the floodgate to the river. If the attack succeeds, Ieyasu will lose many of his men and a great deal of morale. Following the water attack, Masayuki often gloats about his superior intellect.

In Ina's story mode/dream stage, he is a crocked grandfather who is driven back by his daughter-in-law.

Kessen
Although it isn't seen, Masayuki easily stalls Hidetada's men during Sekigahara. He leads a small yet sturdy cavalry unit and relies on high morale and low fatigue to win his battles. If Mitsunari won Sekigahara, the Sanada forces will join his pursuit to capture Ieyasu's head. Otherwise, the player will see him on the Toyotomi side at Harima. Though he's proud of his son's prowess, Masayuki doesn't completely accept all of Yukimura's methods, such as depending on kunoichi and shooting rifles from horseback. He inevitably dies in the later stages of the game, either in battle or due to an assassination ordered by Hidetada.

In Kessen III, a somewhat younger Masayuki serves as an adviser for Katsuyori. He opposes Nobunaga by fleeing and luring his enemy into several ambushes. Once he's out of sight, he hides in waiting and blocks off the path to his lord. Word from the local townsfolk will reveal their locations and win the battle.

Quotes

 * "Ha ha... Now I get to plot my revenge!"
 * "Yuki! I'm giving command of our men to you. You will lead them into battle, Yukimura. Go and bloody Ieyasu's nose! And spread the glory of Sanada throughout the land!"