Kalas would be great, and he's essentially first party now. I'd love to see him in.
I'm also a big fan of KOS-MOS, and here's a moveset that I posted on GFAQs earlier. I'll also add more info to it. Her chances are small, but hey, Snake only had one game on a Nintendo system that wasn't a remake/port(MGS: Ghost Babel, which isn't even cannon to the MGS story)(as opposed to Xenosaga 1&2 DS, which IS the new cannon for episode 2), so I'd imagine Kossy's chances are as good as Snake's especially considering Namco's(KOS-MOS is NOT second party, she and all other Xenosaga characters and storyline are still owned by Namco, although I'd imagine that they'd still allow Nintendo and Monolith to develop it) and Nintendo's good relationship.
I'd kill to have her and/or Kalas in.
KOS-MOS is my favourite videogame character...
Her final smash could be her uterus beam(X buster)
Her costumes could all be different versions of her.
She'd have one of the easiest movests to make, by far. All her attacks would translate well.
^B: Nemesis(fires a blast downwards, creating a shockwave and sending her upwards)(sends enemy diagonally away from you)
>B: F-Scythe(dashes forward and attacks with the F-Scythe)(sends enemy flying towards you)
vB: R-Cannon(charges the R-Cannon for a second, and fires a strong blast. Sends her flying backwards a short distance)(sends enemy flying away from shot)
B: Beam Gun(fires a shot from her beam pistol. Does medium damage, but needs to recharge after each shot. it recharges automatically, but cannot be used until it has recharged over time, which takes about 1.75 seconds)(sends enemy back slightly)
>Smash: R-Blade(diagonal/horizontal slash with R blade)(sends the enemy away with a slightly upward angle)
vSmash: K-Axe(axe kick, counts as a spike if it hits with the heel)
^Smash: R-Blade(upper slash)(vertical)(sends enemy flying upwards at an angle, depending on where the R-Blade hit them)
>tilt: spin kick(forward knockback)
vtilt: R-Blade(shoelace sweep)(knocks opponent up a bit)
^tilt: upwards kick(similar to Zelda's)(sends the enemy flying upwards, much more knockback if it hits with the tip)
A: half spin kick(turns 180 degrees while delivering a kick)(stuns, very little knockback)
A A: spin kick(follows up with a jumping spin kick)(similar to F-tilt, but with less power and knockback, but faster)
Nair: Air Burst(fire surrounds KOS-MOS for a moment, similar to Mewtwo's Nair, but it only hits once with more power and knockback)(knockback depends on which part of the flare was hit)
Fair: K-Axe(spike if hit with heel of foot)
Dair: Needle Kick(think Fox's Dair, but instead of just spinning, she kicks repeatedly as she spins)(very little knockback)
Uair: K-Pike(arm turns into a lance and thrusts upwards)(if it hits with the tip, it will send the opponent 90 degrees upwards. If it hits with anywhere else on the pike, they are sent downwards diagonally at a low speed)
Dash attack: W-Blade(similar to R-Blade, but the blade is longer and weaker)(Sends the opponent flying backwards if hit with the tip)
Her wieght would be mid-heavy, because she's a robot and all(and it fits to her official weight of 92KGs/203lbs), she'd be medium hight(5'6''). She'd have slightly less traction then the princesses(heels and all). Her jumps would be of above-average hight, and her movement speed would be average. Overall, she'd be a well rounded character, with a selection of fast combo moves, and slower moves which could be comboed into. Her main KO moves would be R-Cannon, and her R-Blade smashes, along with her spikes.