Quotes: Marth Debuted in Smash Bros.

"Remember Reiji Arisu and Xiaomu from Super Robot Taisen OG Saga: Endless Frontier? These characters are actually guests from an earlier Monolith Soft game, Namco X Capcom."
Spencer, Siliconera

"Who the hell is Marth? And why should unlocking him be considered a reward?"

"You may know him from the Super Smash Bros. series. Now see how Shulk got his start."
Xenoblade Chronicles 3D official website