Here's a game for you all, suggest up to four characters, in the form of character pitches. Like how in that Smash 4 design document that describes what Rosalina, Robin and Duck Hunt can do as a Smash Fighter.
You must provide a short description of what the character can do (you can relate them to other fighters to give a clearer idea of what they do) and a theme for the character.
Isaac
The main character of Golden Sun, Isaac fights with Venus Psynergy (Earth Manipulation), Djinn (Helpful Elemental Spirits) and a Sword at his disposal. When Isaac fully charges his Neutral, Side or Down Special attacks, his attack will cause a temporary change in the structure of the stage in the area around him, though these changes will eventually revert back to normal after a few seconds. Certain basic and smash attacks will cause a Djinn to come to Isaac's aid, which will not only increase the range of the attack, but temporarily provide a very small boost to one of his stats (attack power, movement speed, damage taken, jump height, etc.) until the next time he uses his attack, which will remove the Djinn's effect. His side smash, when fully charged, becomes 'Ragnarok', a huge ethereal sword which will plant itself in the ground and bury foes.
Theme: Stage Manipulation, Ranged Sword Fighting
Nightmare
The Azure Knight of Soul Calibur, Nightmare fights with a huge Great Sword known as "Soul Edge". This sword weighs him down a lot, making him very heavy and slow, but his attacks really pack a wallop and have huge knockback. When Nightmare attacks with Soul Edge, he recovers a small amount of percentage depending on how much damage he dealt to the opponent (approximately 10%). This HP recover effect also occurs when Nightmare grabs his foe, he can't pummel his opponent, but he absorbs health from them instead. His Final Smash involves summoning a horse made of Shadow, a 'Night mare', and mowing down enemies.
Theme: Hard Hitting Attacks, HP absorption.
Sephiroth
The One-winged Angel, the greatest SOLDIER, and 'son' of Jenova. Sephiroth carries an enormous katana by the name of Masamune. Sephiroth, confident to the point of arrogance, moves slowly and deliberately when not actively running (he 'runs' by gliding, just like Cloud). When he attacks with Masamune, he appears to swing the sword slowly, but actually several wind blades from his fast strokes attack his opponent; as a result, his attacks hit multiple times, but they also take a while to end, so you better make sure not to miss. His Down Aerial, "Hell's Gate", has the property of instantly destroying damageable Assist Trophies.
Theme: Deliberate, multi-hitting attacks.
Tifa Lockhart
The beautiful patron of the "Seventh Heaven" Bar and a member of AVALANCHE, Tifa plays somewhat like a fusion of Cloud and Little Mac. Like Little Mac, her style is mostly about fisticuffs, and she does poorly in the air, and like Cloud, she has a Limit Gauge which, when filled, powers up her Special Moves. She fights with kicks and punches, which do a lot of damage but have relatively poor range; her special moves are Beat Rush (Neutral), a combo move that requires extra inputs; Somersault (Up), a back flip; Meteodrive (Side), a command grab that involves suplexing the character she grabs; and Limit Charge (Down), which works the same way as with Cloud. Her Final Smash "Final Heaven" requires you to play a roulette (wth "Yeah!", "Hit" or "Miss"), the damage it deals depends on how many "Yeah!" or "Hit" slots you get.
Theme: Limit Breaking Fisticuffs