In Super Smash Bros. Brawl Black Knight appears as an Trophy and Sticker.
One of Daein's Four Riders and wielder of the blessed sword Ettard. Once an apprentice to Ike's father, Greil, the two eventually duel, resulting in Greil's defeat. Thought to be dead after losing to Ike and the blessed sword Ragnell, the Black Knight survives and comes to the aid of Micaiah, the leader of the Dawn Brigade, a band of Daein freedom fighters.
In Smash Tour, the Black Knight is a red item. A player using the Black Knight at the beginning of a battle will cause their smash attacks to occasionally have one-hit KO power at random for that battle.
Not even the other members of the Daein army know the truth behind this dark knight. He is Ike's rival in Path of Radiance and the sequel, Radiant Dawn. His mastery skill Eclipse is so incredibly powerful, it'd be understandable if you thought his defeat would bring peace to the war-torn land.