For the last Fire Emblem rep, I'd go with Lyn. She was already an assist trophy in Brawl, plus she'd probably play a lot differently than the other Fire Emblem characters, and she was a main character in the first fire Emblem game released outside of Japan.
As for more first party characters, Little Mac is a great idea, and although I've never played their series Starfy and Isaac sound good, too. Like I said before, an Animal Crossing character and an Advance Wars character would be great, as well.
Edit: Tails sounds good as a second Sega character, unless there's another prominent Sega series that should be represented.
As for more first party characters, Little Mac is a great idea, and although I've never played their series Starfy and Isaac sound good, too. Like I said before, an Animal Crossing character and an Advance Wars character would be great, as well.
Edit: Tails sounds good as a second Sega character, unless there's another prominent Sega series that should be represented.