blog post by Yuuki Aoi says she stayed at Nagano with some old friends, and before they settled down for the night, they played "SumaBura" -- i.e., Smash Bros.
She writes that she plays Link on the GameCube, but Marth on the Wii. She says Marth is good at fighting in mid-air, but she herself isn't, so she didn't do too well. "Must practice," she lamented.
Here is the Wii version's home page. Here is the Gamespot page for the GameCube version.
Here are pics of the two characters Yuuki plays as, Link left and Marth right: