A marksman for the Saiga clan, Magoichi Saiga is an aloof warrior with a great love for war and battle. He is also a book enthusiast and enjoys researching a variety of subjects. Despite his cold exterior, he is an honorable and loyal comrade, as can be seen when Jubei was petrified by Tokichiro and Magoichi fearlessly fought a horde of demons to save him. Underneath his passion for battle, he truly wishes that Japan could live in a time of peace. He fights with a traditional Matchlock rifle, and can attack many enemies from long-range. Magoichi has a petty rivalry with the spearman Ekei and the two are often found quarreling, but deep down they share an untold respect for one another.
In the story, it was believed that he was working for Nobunaga in order to become rich. However, after Jubei saves him in his hour of need, Magoichi reveals that he would not serve someone as nefarious as Nobunaga. It is revealed that Magoichi became an orphan when his mother died after giving birth to him, and was raised by the women of his village. Because of the love and generosity they showed him, Magoichi fights to protect his village from being destroyed by Nobunaga's army.
Towards the end of the game, he meets Jubei for the final time and tells him he must head back to his village, which will soon be under attack by Nobunaga's forces.