Fire Emblem is a very different franchise. Every game it changes its set of characters completely, the only characters that have appeared in multiple Fire Emblem titles are Marth and Ike, and at the time of their inclusions in Smash they didn't even have that distinction. Not to mention that Lucina and Robin are two out of three main characters in Awakening, with Chrom being the only one of those not playable in Smash.
Metroid is obviously very different, Anthony is in reality just a really minor character in an overarching series with much more important characters.
Furthermore, we already know that uniqueness trumps popularity from Rosalina's inclusion over Bowser Jr and Toad, Robin over Chrom was exactly what I was banking on until Gematsu part 2, so if anything was to discredit Gematsu it was Robin for sure. Lucina is one of our token last-minute additions, so that doesn't really count. Luckily for us Ridley has the chance to be one of the most unique characters on the roster while being popular, Chrom or Bowser Jr didn't have that.
So no, Anthony is still not a possibility in my eyes, especially not with all the Ridley teasing.
Yeeeah, unlike Metroid, every two or three games Fire Emblem changes casts and continuities entirely.
- The first game stars Marth.
- The second game is a side-story in another continent.
- The third game is a sequel to the first.
- The fourth game is a thousand years BEFORE Marth and on a THIRD different continent.
- The fifth game stars slightly different characters and is a midquel of the fourth.
- The sixth and seventh games are literally in their own independent continuity.
- The eight game is in its own independent continuity.
- The ninth and tenth game is ITS own independent continuity.
- The eleventh and twelfth games are remakes of the first and third.
- The latest is 2,000 years AFTER Marth with a mostly different cast.
Fire Emblem is a mess of complicated when it comes to picking characters. They're really best off with "The first lord and some new lords".