Samus is on the melee box. Only 3% of it maybe but she's there on the side.

@HylianBran This is limited to the images Backloggd provides. She looks pretty cool on the original intendo All-Star! Dairantou Smash Brothers cover.

I think I remember reading something on the home page about them wanting to let you add custom box art for games. If that comes to pass I guess you have to redo the list