For Project M, here are the top five people I think should be in it, and my preference for each (they're all speed characters, I know lol) blue are ones I really want in there:
1# Waluigi (long awaited)
(his moves have already been revealed, actually cause he's in the making on the Project M videos. He looks great, though can't wait to play him)
2# Isaac (definitely long awaited)
Fast character, and make use of that big aura hand that he used in his Assist Trophy form, like make it his B move and let him charge it up so he uses it as he did in that form that would be sick, rather than being a final smash which would be awkward. He should also have a mix of sword and punch based moves, and give a plot twist by making his forward smash a melee attack in place of his sword to confuse people, would be interesting.
Final Smash: Releases a big orb into the sky that goes above screen level then grows in size to form a sun. Isaac then absorbs this sun, rises and begins to glow. After this, he starts healing and lowering his damage counter back to 0%, but every percentage is taken from an opponent
However high Isaac's damage counter is, it keeps refilling until it is at 0% and whatever damage is left from opponents is the percentage taken. He takes 1 at a time from each opponent, at a rapid fire speed (so 3 opponents, with one percentage per opponent would fill 3 percentage for Isaac well causing 1 percent damage for each opponent) well screaming.
So if Isaac had 100%, and there were three opponents, each opponent would receive 30% in their damage counter, with one receiving 31%.
After his health is regenerated, he uses a psynergy aura push (similar to Goku's Ki-Blast move in Tenkaichi 3 where all he does is spread his hands and it pushes the opponent away) and that deals 20% to each opponent, and has half the strength of a home run bat smash. Isaac then descends, ending the smash.
3# Ray MK III (looked interesting)
Fast character, projectile moves similar to Megaman in SSB4 and definitely have a hold jump levitation thing similar to Peach and Mewtwo and his Up-and-B could be something cool too. Should definitely take advantage of his laser and missile moves for his main A moves, rather than punching. His B moves could be alternate, more powerful projectiles. Maybe even give him a charge laser for his regular B, similar to the redesigned Ivysaur's beam.
Final Smash: All his A moves are powerful lasers, down A shoots two lasers in both directions (well grounded) and either direction shoots the laser that way. Holding jump puts him in endless rocket levitation that is very zig-zaggy and quick as he is in Assist Trophy form. When in the air, his down A instead shoots downward.
4# Dark Samus (definitely different, unlike DARK PIT why was he the same thing again)
Well Samus is known for being kinda clunky in the speed zone, Dark Samus should definitely be much quicker. Haven't seen her in action at all in the games, but whatever moves you can implement from them, do that. But definitely make her fast, cause that way it truly is an opposite clone of Samus.
Final Smash: No clue, maybe whatever she did in the Prime games that was big and frightening that dealt a lot of health off Samus.
5# Lyn
Fast, again haha. But, actually really fast, faster than Fox. Make her sword moves quick, yet deadly. Make even her smashes go through quickly, not charging of course but when they're released. Make her forward smash deal not one, or two, but three hits (similar to how Link's can do two if A is pressed again) each time A is pressed. Anything else is up to the creator, but preferably make her fast in her moves and base her style off the way she played in the game, but really quick.
Final Smash: Unsheathes her sword, disappears, everyone stops moving and an explanation point is shown above each player, then suddenly everyone receives 50% damage, then she reappears and they're all shot off the stage after she sheathes her sword.
That is all I got for my recommendations. Hope people enjoyed my preferences.