Ice and Spark have always been some of my favorites in the games they are. Stone as well specially in the 2.5D games in which it has an expanded moveset. I also love Mirror and I was so happy when it came back in Robobot. Oh and I can't forget the Twin Lightsaber and the BURNING SUPERDEATH SWORD from Kirby 64!
In Round 1 they were randomly chosen, in Round 2 they are pit together based on how they did in Round 1
"BILL GATES!? NO WAIT, THAT'S MY GAMECUBE!"
Well, that's the thing with Eclipsa. While she's foreshadowed to be a villain, in the end she is simply someone who was misunderstood and not trusted for her knowledge of dark magic and marrying a monster.
I did consider her to be in Team Bipper at first, but I later realized that considering her a villain would be completely missing the point of the character, so I went with Game Gear instead.
Saying it would be big spoilers as there are a few I already want to bring back
Wait, make you a stage?
Still too early
I can answer both questions with the same answer:
I like the game
Basically any character that borrows moves from other characters but are different enough not to be considered Echo Fighters. Falco, Roy, Isabelle, Ganondorf, all the Links, Dr. Mario...
Not Lucario though he has nothing to do with Mewtwo. I am unsure about Luigi, Wolf and Lucas because they change a lot but so do mirror fighters sometimes so...