I think it was the time constraints that caused Mewtwo to be cut. I haven't been here much (I just signed up today, after all) but from what I've seen around the internet, Mewtwo is a very popular character, not to mention there's his incomplete folder. But, this thread isn't about Brawl, it's about SSB4 predictions SO, I'm leaving that alone now.
Anyway, I think that in SSB4 they should keep all the Melee and Brawl characters. I can't stand it when a character from a series' previous game is cut, it really just kills the game for me.
Newcomers I would like are:
Geno
B- Geno Beam (Chargeable)
Side B- Geno Whirl (Pressing B exactly .0000001 seconds before it hits=instant KO)
Down B- Geno Blast (Like Pikachu's Thunder)
Up B- Geno Boost (Like Extreme Speed)
Final Smash- Geno Flash (Hold B to increase power)
Dark Samus
B- Scatter Shot (Tons of tiny Phazon Bullets, like Bullet Seed but forward instead of up)
Side B- Phazon Missile (No Super Missile)
Down B- Phazon Shield (Like on Metroid Prime 2)
Up B- Screw Attack (More power than Samus', but doesn't go up as high)
Final Smash- Metroid Prime (Kind of like Giga Bowser)
Toon Zelda (Sorry, other than Down B, she would be a clone. Blame the Zelda series for not giving her more moves.)
B- Nayru's Love
Side B- Din's Fire
Up B- Farore's Wind
Down B- Tetra (Transform)
Final Smash- Light Arrow
Tetra (At least she isn't an EXACT clone of Sheik)
B- Bomb
Side B- Chain
Up B- Grappling Hook (Like on Wind Waker)
Down B- Toon Zelda (Transform)
Final Smash- Light Arrow
Toon Ganon
B- Warlock Punch
Side B- Sword Dance (Like Marth + Roy's Side B in Melee)
Up B- Levitate
Down B- Magic Sphere
Final Smash- Helmaroc King (The giant bird from Wind Waker, similar to an Assist Trophy but much stronger.)
Mega Man
B- Charge Shot (Have to hold B to charge it)
Side B- Super Knuckle
Up B- Rush Coil (Like Sonic's Spring Jump)
Down B- Mega Kick
Final Smash- Hyper Mega Man
Clefairy: (I just like my idea for her Final Smash, mainly.)
B- Scratch
Side B- Double Slap
Up B- Sing
Down B- Rest (unlike Jigglypuff's, recovers damage if she is not hit before she wakes up)
Final Smash- Metronome (Does any random character's Final Smash. They do not have to be on the field at the moment to use their final smash)
Raichu: (We already have the other two evolutions, why not?)
B- Thunder Jolt
Side B- Skull Bash
Up B- Agility
Down B- Thunder
Plusle & Minun
B- Double Thunder Jolt
Side B- Double Iron Tail
Up B- Helping Hand (Like Ice Climber's Up B, but instead of a rope, the one who is cpu controlled tosses the one you're using)
Down B- Switch (Plusle is stronger, Minun is faster)
Mii:
Mii's moveset can be customized for each individual Mii you have by giving them the attacks of other characters. Size/Weight/Voice changes based on Mii channel data, like on Mario Kart Wii. With a USB microphone, you can record your own voice for use with the Mii, but your voice would not be heard online.
Veterans' changes/additions:
Dr. Mario:
Final Smash- Check-Up (Throws pills everywhere randomly OR could be a combo like Triforce Slash)
Pichu:
Side B- Thunder Shock
Final Smash- Volt Tackle
Mewtwo:
Final Smash- Whims of Water (The storm he created during the first movie)
Roy:
Final Smash- Final Flare Blade (charges continually until someone comes into range, then hits automatically)
Young Link:
B- Slingshot
Final Smash- Fierce Deity
Toon Link (If he's even there WITH Young Link. I don't care either way, as long as there is one of them.)
B- Fire/Ice Arrow (Random)
Final Smash- Ballad of Gales (Giant Tornado traps opponents inside, like Meta Knight's but much bigger and stronger.)
Falco-
Final Smash- Arwing (He DOES prefer the air!)
Zamus-
Final Smash- Ship (Calls her ship. You fly it around the stage and bomb people, while Zamus stays in one spot. Landing it beside her before time is up makes her go inside and put her suit on, while recovering some damage)
Ness:
Final Smash- PK Rockin'
Pikachu:
Side B- Iron Tail
No random tripping, and the ability to turn certain Assist Trophies and Pokeballs On/Off would be good. Also, more customization for custom stages, like the ability to add water or lava.
Oh, and the name could be changed to Ultra Smash Bros. Then after that could be Ultra Smash Bros. Melee and Ultra Smash Bros. Brawl.
Eh, I had a lot more to type, but I forgot a lot of it.