Well, first starters, I'll just say that Neglected Mario Characters has been around for 5 years now (as of yesterday). When I started the site on Kyle's Super Mario Bros. HQ, I started it on the simple belief that Mario was the main character of his games and as a result, he got most of the credit. The other characters, were merely extras. So, my goal at NC was to give a little spotlight to those "other" characters in the Mario games. At the time, Luigi was very much neglected (and sure, I still think he's neglected, although Luigi's Mansion was awesome). At the time when I started, Luigi hadn't had a decent roll in years. He had stupid parts in Yoshi's Island and Super MaRPGio. And he wasn't in SM64 at all. Luigi was simply the 2nd player for Mario games. Now, Luigi's Mansion did some to help Luigi's fame, but for the purposes of the site, he's still an NC.
Yoshi is an NC too, for the simple rule that I keep at NC. The rule is, "All characters are Neglected Characters except for Mario." Sure, Yoshi has his own series of games, but in the world of Mario, all characters are secondary to Mario, and so, this page is dedicated to them.
Well, that sure sounded self-rightous.-jay