OK moldrill here is modified version of the, hopefully final, story:
Name: "Super Mario World 3: Bowser's Conquest"
Story: Mario, Luigi, and Peach are taking a walk along a shore in Mushroom Kingdom when Bowser swoops down in his Koopa Copter and nabs the Princess. Kammy, following behind, attempts to zap Mario but he darts out of the way. During Mario's struggle with Kammy, Bowser, using a mysterious object, warps Luigi into the mysterious object. Mario attempts to stop Bowser but is distracted by Kammy's persistent blasts. After completing their mission Bowser and Kammy run off, leaving Mario alone. A bright light fills the sky and the land, under Mario's feet, disappeared causing him to fall into the water below. Will Luigi ever get out of that thing? And what is it? What caused the Kingdom to change so suddenly? Will Mario save Princess Peach?
Changes:
1. Luigi is not physically captured but trapped in the mysterious object Bowser held
2. Luigi is captured in order to break away from the repeated Princess captured Brothers save the day thing and up the ante a little.
3. Luigi will be playable in side-quests after each World Boss
4. E. Gadd may still be in it if anyone has any ideas for an alternative person to carry the story ya know like in Paper Mario TYD where a goomba scientist helped Mario out? FYI: I will give a ZFGCer a cameo on this game if you can give me a custom sprite of the ZFGCer that includes:
Walking (left/right)
Standing (left/right)
FYI: In a 2D side-scrolling enviroment
Any other animations you want to give your charcter emotion.