Red Arremer
Member
Nameless character from an extremely divisive spin-off will never, EVER be playable in smash
As it currently stands, there is no other choice that would make sense. Furthermore, Marine makes sense even further because he's the first protagonist character from a non-Samus Metroid game.
Also, I would argue whether a game or character is controversial or not doesn't really matter in regards to them getting picked for Smash. Remember that we got the Other M version of Ridley in Smash 4.
Federation Force is the latest entry to the Metroid series. As such, it is the most likely to get content for Smash.
Sylux is easily the biggest threat to Ridley (after Sakurai)
Sylux hasn't appeared in any game since Prime Hunters. And yes, I'm aware of his cameos in Prime 3 and Federation Force, but those hardly are relevant. Once Sylux returns and is an actual character, then I can see him happening, and then yes, I also can agree that he's more likely to be included. But as it stands right now, he's so much less relevant than Marine or even, like, Anthony and Adam.