If the 12 x 5 layout is indeed what they go with, and the 5 most often rumored DLC characters are included into the rows with their respective series, same goes for the 3 clones, your layouts here actually work pretty well.
Here goes:
1. Mario, Luigi, Peach, Bowser, Yoshi, Rosalina, Jr., Doc, Wario, DK, Diddy, Dixie - 12
2. G&W, Mac, Duck Hunt Dog, Link, Zelda, Sheik, Ganondorf, Toon Link, Impa, Samus, ZS, Ridley - 12
3. Pit, Palutena, Pittaggin, Marth, Ike, Robin, Lucina, Kirby, Dedede, Meta Knight, Fox, Falco - 12
4. Pikachu, Charizard, Lucario, Mewtwo, Jiggs, Greninja, ROB, Ness, C Falcon, Villager - 10
5. Olimar, WFT, Chorus Men, Shulk, Pac Man, Megaman, Sonic, Miis, Random - 9.
Seems to fit the Sakurai approved layouts that we've seen before.
It's whatever though. As long as they shove Mewtwo in there, I'm quite happy.