Mario: 100% Chance. He's Mario
Dr. Mario: Very very low chance. He would fit better as a Mario Color
Luigi: 100% Chance. Perfect Attendance
Princess Peach: 100% Chance. Very unique character design and a female character.
Bowser: 100% Chance. Mario's ultimate villain
Donkey Kong: 100% Chance. Perfect Attendance not to mention king of a whole series and Mario's first enemy.
Diddy Kong: Very Likely. One of the only two DK characters.
Yoshi: 100% Chance. Perfect Attendance.
Wario: 100% Chance. Very different from Mario. King of his own series.
Link: 100% Chance. Perfect Attendance not to mention king of his own series.
Princess Zelda: 100% Chance. Female Character. Unique moveset.
Sheik: Very Likely. Good attendance.
Ganondorf: Very Likely. Ultimate Villain of Link. But he is a half clone.
Toon Link: Very Likely. He represents a whole section of the Zelda games.
Young Link: Very low chance. He was replaced by Toon Link.
Samus Aran: 100% Chance. Perfect Attendance and queen of a very important series. And she is female.
Zero Suit Samus: 100% Chance.
Pit: 100% Chance. Master of his own series. And he had a new popular game. Sakurai.
Ice Climbers: 100% Chance. Masters from a classic series. Good Attendance.
R.O.B.: Likely. Represents an era of gaming.
Kirby: 110% Chance. Perfect attendance. King of his own series. Sakurai.
Meta Knight: 100% Chance. One of Kirby's famous villains. Sakurai.
King Dedede 100% Chance. Sakurai wanted him in Smash from the beginning. Main villain from the Kirby series.
Pikmin and Olimar: 100% Chance. Represents a whole series.
Fox McCloud: 100% Chance. Perfect Attendance. King of his own series.
Falco Lombardi: Very Likely. Good Attendance. But he is a Semi Fox clone.
Wolf O'Donnell: Very Likely. Fox's villain.
Captain Falcon: 100% Chance. Need I say more.
Pikachu: 100% Chance. Pokémon's extremely famous mascot.
Pichu: Not Likely. Did not make it into Brawl........ as Pichu. And he is a Semi Pikachu clone.
Pokémon Trainer: Likely. Unique Character Design.
Mewtwo: Not Very Likely. Did not make it into Brawl. However he represents Pokémon's Villain.
Lucario: Not Likely. He was new at the time. Not anymore... and there are some that can replace him.
Jigglypuff: 100% Chance. Perfect Attendance. Unique Character Design. Female Character.
Marth: 100% Chance. Master of the Fire Emblem Series. Also new game and good attendance.
Roy: Not Likely. Japanese really love him but he is not new anymore, he is a Marth semi clone, and he did not make it into Brawl.
Ike: Likely. Very Unique Design and fan favorite in Brawl. But he is not new anymore.
Ness: 100% Chance. Perfect Attendance. King of Series.
Lucas: Very Likely. Not to many Earthbound Characters. But he is a Semi Clone of Ness.
Mr. Game & Watch: 100% Chance. Represents a whole era in Nintendo history.
Solid Snake: Likely. He is a popular 3rd party character.
Sonic the Headgehog: Likely. He is a popular 3rd party character.