Cain (Shadow Dragon / (New) Mystery)

Trivia

 * Cain was the sole survivor of the battle that Marth's father, King Cornelius, was killed in. Cornelius ordered him to deliver Marth his last words, which is why he survived. His desire to avenge his fallen comrades and belief that he failed as a knight that day is what drives him to train so hard.
 * At the end of Book 2 of Mystery of the Emblem, Cain becomes Marth's closest advisor and assists him in ruling Archanea. (His French title, Voix du Roi, translates to Voice of the King.)