I dont see why we have to rep the first game to go international. just seems like a poor excuse considering we've had Roy in the past and they could just as easily re add him. its not that they arent the lead characters. i dont have any problem with that. its that Lucina pretends to be Marth and as such would play exactly like him. she would be best repped through a costume at best as there's little reason to make clones now cause bulking up the roster isnt a necessity this time around.
i would argue that Micaiah is far more interesting (Gameplay not personality or story wise) and would be a better addition as it represents a different class in fire emblem as well being a lead character in her game as well. but whatever, i care little for Fire Emblem. though the protagonist really should outprioritize supporting cast regardless of the series in question and since Marth isnt the protagonist in all of the games that sort of changes up the whole way the series needs to be looked at.
I said she was less essential than Palutena. not that she's less important than Hades.
I just dont see Starfox getting a fourth character while certain larger and more consistent series like Donkey Kong, Metroid or even Fire Emblem may have only 3. Nor do i see any reason to put Krystal in place of Falco or Wolf.
All well and good, I'm just saying those characters you mention have things working against them as opposed to certain other characters regardless of gender.
I'm not a fan of readding Roy because as opposed to other available Fire Emblem fighters, I haven't played his game. I don't know his story and as a clone his moveset isn't interesting. If they decloned him, it'd be similar to adding another character.
Lucina isn't a clone of Marth and she doesn't pretend to be Marth throughout the whole game. She uses Marth as an alias. In the game, she actually fight nothing like Marth. From the moment she becomes playable, she is her own character. She is double handed sword wield who crouches and favors stabbing as opposed to slashing. They use the games as a reference so she would fight as she does in the game, which is completely different than Marth. And as Lucina, she looks different than Marth considerable. Darker colors, the long hair, height, body type. Put two pictures of them together and see if anyone gets confused. The only knock I got against Micaiah is that we already have Ike, and third rep should be from another game in the series if he stays, She would make a great assist trophy.
I don't think Medusa's role was significantly downgraded in Uprising, she just played a different role in the story. That's what I was responding too. I was just explaining the role in relation to Hades and her chances above him (her competition as a villain in the KI series). We don't know what Sakurai wants to add from KI yet. He might pick the goddess or he might pick a villain.
Sakurai generally cuts clones first, and Star Fox has two of them, as decloned as they might be. I dont see why they are immune from getting cut, especially Wolf. In Starfox Command, all the characters play more as less the same role in relation to Fox.
Any newcomer discussed has things working against them. That's why they havent appeared in a Smash yet. But on the level of characters who merit inclusion based on their role in their games, I think all the characters listed have met that test. It's just up to the developers to see what makes these characters great.