Nintendo's in need of a new IP that would boost the character and series pool for good, and I can think of no better series than Metal Combat. However, there is the little matter of how said characters would work in Smash.
So here's the nitty gritty.
It's 200 or so years in the future from Metal Combat: Falcon's Revenge. Giga-Desp has long since been trashed, and the galaxy has been at peace for a very long time. Surrounding galaxies are stunned and appreciative of the defeat of the Eltorian Empire and lend Earth a hand in its economic recovery. With fiscal policies and commercial infrastructure restored, in addition to the environmental and political influence of neighboring civilizations, Earth has flourished and has even become a more stable planet geologically speaking. Every decade, there are commemorative ST fighting tournaments which serves a dual purpose: a conference of the most advanced fighting machines in that sector of the galaxy, and, of course, public awareness/celebration. In this newest iteration for the Wii, Metal Combat: Tercel Factor, you play the role of 19 year-old Keith Mollard, a relatively new ST pilot that received general military training and has largely self-taught his way to the top due to a lack of finances that would have allowed him to attend higher-league academies. This tournament, your first bout, a Tutorial Match, is against Keith's rival, 22 year-old Zane Eugene, a member of the prominent Eugene family that continues to aid in funding many of the ST Training Academies. Keith is deeply upset by the fact that the utmost training is still dependent upon money, that all soldiers can't perform their civic duty to their full potential, and is eager to defeat Keith to prove that the current system is flawed. So eager, in fact, that he becomes more and more agitated as Zane gives him a tutorial on fighting basics before their match. Zane did not mean for it to be condescending; he merely intended to make sure that his opponent would be some sort of a fair fight. Keith is too upset to hear Zane out, however, and the battle begins. In this battle, you can lose or win. Either way, Keith and Zane share an exchange shortly afterwards.
But it's brief. Zane's ST Hurrican disappears in a flash of light. An extreme attack has destroyed over half of the participating ST's and severely damaged the rest, and ground zero was the exact spot where the Hurrican was located. The Eugene family is divided regarding the rightful position of the Eltorian Empire and have declared war on the entire Solar System in the hope of conquering it. Their initial attack was a three-pronged message: the declaration of total war by indiscriminately destroying various representative ST's, the destruction of Zane who represents the less ambitious and supposedly weaker side of the family line, and the destruction of the ST Tercel, Earth's secret weapon, to prove their intelligence network.
We find out that Keith and the ST Tercel were teleported to safety by a cyborg named Alor. To Keith's shock, Alor reveals that the ST Tercel is indeed the ST Falcon that has been upgraded over the centuries in secret in just such an event that Earth might one day need another savior. The UN immediately declares Keith and the ST Tercel the only appropriate soldiers for the task, regardless of the outcome of the game's opening match. You are not alone, however; those same neighboring civilizations each have their own representatives. Unfortunately, no one can decide which ST is the strongest, so each civilization agrees to hold friendly challenge matches against one another, and the last ST standing will commence the first wave of attack with the other ST's being repaired and upgraded as backup should the lead ST pay the ultimate price.
The ST Tercel is unique in that it can be customized; in fact, if you so choose, you may dismantle the ST Tercel and use bought parts to create Keith's own ST and begin his own legacy, but the name stays. Now, one drawback of most customization schemes is that they are typically dramatic upgrades. Golf games, Mario RPGs, Devil May Cry, etc. Not so in this game; they are nominal enhancements or, moreover, preference-based options. Such examples would include shields that are controlled by the Nunchuk, detachable Kamikaze body parts that will reduce your HP for more damage, more fragile but more powerful weapons, uniquely styled bodies that have extra functions such as jumps, larger bodies that take less damage but get hit more often and vice versa, etc. You will be able to give your ST Tercel its own look due to what parts and engines you decide to use in addition to its own color scheme. To put it simply, a better version of F-Zero GX's customization in that the standard-blueprint ST's and Tercel are not far superior to any user-created combinations.
Game plays pretty much the same way as the previous installments, except for some differences. You can have a shield, though, and again, that's controlled with the Nunchuk. You may opt for movement via the Nunchuk's stick or auto-pilot. A secondary white square inside your visor and field of view will clearly represent the shots your ST will avoid if they fall outside that box; again, this depends upon your evasive speed and ST size. Be warned, shots are not forward-directional anymore; shots are now angled. Though you point at one spot of the screen, the angle at which you hold the Wii Remote WILL affect the shot's ultimate destination.
ST's are single-piloted and much smaller, usually only slightly larger than heavy-armor battle suits. In Smash, this would approximate to only slightly above Bowser's height. This eliminates size considerations.
[spoiler]Alor is Rola. Same ST, too. Zane and the ST Hurrican are available after beating the game. Alor also rescued Zane, and he'll have a story mode where you'll cross paths with Keith. Easy, Normal, Real difficulty modes. No ranking, but there is a secret boss, the ST Tornado; Rola's and Carol's genetics were used in creating clones and more members of the Eltorian race, and Carol was cryogenically frozen by the evil side of the Eugene family and Eltorian empire as a backup specimen. But yeah, she'll use the upgraded Tornado, with newer Treble Hyper Shot and a Bomb or two on ya; tooth-and-nail fight.[/spoiler]
EDIT: I wrote all that?
Nintendo, hire me already!!!