The black Chrom represents Wonder-Blue, a blue-haired sword-wielding protagonist with a blue-and-black color scheme.
The blue, cyan, green, yellow, and pink Villager minions represent the colorful civilians that can be recruited in The Wonderful 101.
The stage and music track represent Blossom City, the massive futuristic metropolis setting of the first few missions in The Wonderful 101.
The first battle condition references how the current "leader" of the team in The Wonderful 101 can be harmed while all other team members will only be temporarily knocked out from an attack.