Seeing as how Metroid Hunters is a pure FPS, I thought if would be great to have this mode as an alternative to a bunch of battling Samus Arans.
As far as we know, multiplayer in Hunters will just be a max of 16 Samuses running around, basically using single player weapons (and some multiplayer exclusives) on maps probably based off single player levels.
But we all know there is much more to the Metroid universe than Samus, and seeing tons of Samuses running around is pretty silly anyway. And come on, the more multiplayer modes in an FPS the better.
So I was thinking about a Federation vs. Space Pirates mode. You pick a race, human marines (like from Fusion or Prime 2) or Space Pirates. Each would have it's own HUD, weapons, special stuff. Stick in vehicles if you want. Think of awesome team deathmatches, capture the flags, and anything else they can think up. Plus it would be sweet having the choice between two races. Humans could have things like advanced hud, great armor, Space Pirates could have sweet jumps and evasive moves, and those sweet blades on their wrists for melee combat.
And think how awesome it would be if you could choose different classes to make your own perfect team, example for humans medic soldiers, scouts, front line, for Pirates things like elites, troopers, commandos, the sword ones that can turn invisible, maybe even flying pirates (humans have armored vehicles, pirates can fly?).
Maybe even throw in co-op single player missions where you and your friends build your perfect Pirate or Federation team, then go through co-op scenarios against the AI, or even against an enemy human team with their own mission objectives which you must stop them from achieving. You'd have to manage your team, splitting up maybe with one half doing objectives and other half trying to sabotage the enemy team. With 8 players per team it would be so much fun, especially if this game supports Wi-Fi which it had BETTER, or so many people are going to be pissed.
Stuff like that would really give you awesome stuff to do even after completing the single player game for people who get tired of the samus deathmatches. And by having it deal with Pirates and Marines you won't have so called Metroid purists crying over their sacred game being defiled either. And before any fanboys draw parallels to Halo 2 and start whining, shut up

First, in halo 2 covanents and spartans are exactly the same, and second, I wasn't even thinking of Halo 2 when I came up with this. I was thinking about how cool it was in Monolith's Aliens Vs. Predator 2 was where you had an FPS where you went through the race as an Alien, a Predator, and a human soldier, all unique. And man, that game was freaking scary when you were playing as the little soldier.
Unfortunately, I'm fully expecting Nintendo to take the lazy route and just have standard deathmatch modes that haven't changed since the days of Goldeneye... sigh...