For those wondering, these fighters have been revealed, just in the lyrics of my We Didn't Start the Fire parody.
Here's a list of their Final Smashes! 01x: Hatsune Miku- Caramelldansen 02x: Bastion- Configuration: Tank 03x: Lilac- Dragon Boost 04x: Fancy Pants- Big Bad Eraser 05x: Maxwell- Starite Storm 06x: Bomberman- Omega Explosion 07x: Squigly and Leviathan- Draugen Punch 08x: Luna- Mega Planetoid Crush 09x: Ashley- Cruel Cloud 10x: Insomni- Eternal Insomnia 11x: Question- Dragonoid Judgement 12x: Shovel Knight- Order of No Quarter 13x: NiGHTS- Wizeman 14x: Taokaka- Dancing Edge 15x: Blaze- Burning Blaze 16x: Rouge- Team Dark Takedown 17x: Porky Minch- Giygas 18x: Castle Crashers- All Out Crash 19x: Pepsiman- Omega Quench 20x: QWERTY- 3 Time Copy 21x: Kanna- EIR 22x: Rayman- ? 23: Shantae- Destruction Dance 24x: Tetronima- Ultimate Tetris 25x: Amoria- Frolic of Blades 26x: Vemoria- Shroud of Emptiness 27x: Shantae-EVO- Uber Vapor Dance