Krystal - Difficulty: ***
-Play 250 Vs. Matches
-Clear Event Challenge #27 - "Turmoil on Sauria" on Hard or higher
Bowser Jr. - Difficulty: *
-Play 10 Vs. Matches
-Clear Classic Mode with Bowser on Easy or higher
Dixie Kong - Difficulty: *
-Play 30 Vs. Matches
-Clear Event Challenge #4 - "Going Bananas" on Easy or higher
Falco - Difficulty: **
-Play 160 Vs. Matches
-During Adventure Mode on Normal or higher, clear all StarFox stages and battles without losing a single stock
Mewtwo - Difficulty: ****
-Play Vs. Mode for 30 hours
-Clear Event Challenge #48 - "Mewtwo's Revenge" on Hard or higher
... and just because:
Mega Man - Difficulty: ****
-Play 450 Vs. Matches
-Clear Event #50 - "The Blue Bomber" on Hard or higher
Sonic - Difficulty: *****
-Play 500 Vs. Matches
-Defeat 10 Wire Frames in Cruel Melee