Saber (Fate/Grand Order - Yagyū Munenori)

The unnamed swordsman is a character appearing in Fate/Grand Order.

Background
The swordsman's name is unknown, but he tells Musashi he is a figurehead of the Edo Yagyu.

Fate/Grand Order
During Musashi's travels through alternate worlds, she fights the swordsman briefly before deciding to run away. As she enters through the portal to the next world, he lands a strike that hits her heads, knocks her out, and causes her brief amnesia in the next world. After she disappears, he says he will remember her name.

Abilities
Although able to withstand his sword strikes, Musashi says the swordsman far surpasses her and runs away from the battle.