Am I Nuts Or What?

I dunno. Weird thoughts of these four accompanying Snake, Sonic, Sora, and Neku in the fourth Smash Bros. have been swimming in my head like crazy!
Least likely seems to be either The Boss or Riku. Iunno.

<THE BOSS> (Metal Gear Solid 3)
- Light frame, but heavy knockback.
<Stan> Stun Grenade (weaker than Hand Grenade, but oft deals dizziness)
<Side> Cobra Bite (a disarming grab-and-slam)
<Up> Safety Tether (basically a tether recovery)
<Down> EZ Gun (very small dmg, deals sleep)
<FINAL SMASH> Patriot (boards a helicopter and wails on foes with her Patriot firearm)

<SHADOW THE HEDGEHOG> (Sonic Heroes?/Shadow the Hedgehog)
- Bit slower than Sonic, but also a bit stronger.
<Stan> Chaos Spear (lunges forth with Chaos power)
<Side> Spin Dash (same as Sonic's)
<Up> Chaos Warp (teleports with a dark explosion)
<Down> Spin Charge (same as Sonic's)
<FINAL SMASH> Chaos Control (greatly slows down all foes and reduces their endurance)

<RIKU> (Kingdom Hearts/Kingdom Hearts: Chain of Memories)
- Average power and quick attacks, just a bit slower than usual.
<Stan> Dark Aura (charges and launches an orb of darkness)
<Side> Dark Break (leaps forth; if he hits a foe, he'll sword-bounce off him/her)
<Up> Dark Corridor (teleports using a dark corridor)
<Down> Dark Shield (forms a shield for a second to ward off attacks)
<FINAL SMASH> Dark Riku (gains immense power and attack speed)

<BEAT> (The World Ends With You)
- Bit stronger than average, but with great jump power.
<Stan> Summon Rhyme (Rhyme's Noise jumps forth, pouncing down whatever foe she hits)
<Side> Street Surf (grinds hard on his skateboard; almost like a charged Rollout)
<Up> Air Cancel (jumps high up at a back angle; takes no damage while doing this)
<Down> Board Slam (launches down at an angle on his board and slams into the arena, setting off a shockwave)
<FINAL SMASH> Tsunami (surfs a wave from one side to the center of the stage, then does the same for the other side; these waves will push foes around; then, he delivers a harsh damaging wave from the back of the stage)

So...yeah. Feel free to bash.

The Boss (c) Konami
Shadow (c) Sega
Riku, Beat (c) Square-Enix