Okay, also if you don't mind my saying, I've changed my mind on all 3 of them, and I've decide to switch my vote to the "Marvelous Heroes", Dion, Max, and Jack. The reason I think they can be on the list is because:
I picture the 3 boys to switch out between battle, or least, be separate playable characters. Anyway, Dion could be a Speedster with Trickster properties, such as using various attacks to keep you confused. But he could be an All-Around character, with some fist-fighting moves overall. Also, I imagine him to be about the height of Ness and/or Lucas (Unless, they have the same height. I haven't seen them that close to each other in Brawl.) if not a bit shorter.
Max could obviously be a Bruiser, and as a bit of an added "joke" he'd be equipped with a few Resistor properties despite his appearance. Due to this, Max can also carry objects such as Crates and Barrels with ease and similar to Donkey Kong, he can move while carrying and he moves quite fast doing this. Not as fast as DK, but quite quick enough.
Jack seems like can be a bit of a Zoner while building different gadgets to help him in battle (Summoner) and also has an amazing jump height, almost reaching that of Falco in Melee and also his throws can all set up into combos, so he racks up damage well.
Also, their game actually has a bit of a cult following (along the lines of EarthBound) and overall, their popularity isn't much, but they could the unique gameplay mechanic of switching out during a battle. (Or simply make them separate playable characters, whichever comes first.)