Just because I thought it'd be interesting, I pulled up the list of characters that Sakurai mentioned on his blog before the Brawl site came into the form we know it in today, as well as the top picks from the character poll that he had on the initial Smash site...I'll be updating this list by bolding all of the characters that end up making it in the game! =D
(I love how Famicom Detective, Advance Wars, Drill Dozer, and Golden Sun appear on Sakurai's List, as I'd take them as playable characters or Assist Trophies! =D)
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List of Characters Sakurai Mentioned In His BlogKoopa Troopa (Super Mario Bros. - 1985) - Adventure Mode EnemyHammer Bros. (Super Mario Bros. - 1985) - Assist Trophy & Adventure Mode EnemyToad (Super Mario Bros. 2 - 1988) - Peach's tool, yet again!Petey Piranha (Super Mario Sunshine - 2002) - Adventure Mode BossVivian (Paper Mario: The Thousand-Year Door - 2005)
"Cel-Shaded" Link (The Legend of Zelda: The Wind Waker - 2002) - Playable CharacterTetra (The Legend of Zelda: The Wind Waker - 2002)
Link's Uncle (The Legend of Zelda: A Link to the Past - 1991)
Ganon/Ganondorf (The Legend of Zelda/The Legend of Zelda: Ocarina of Time - 1986/1998) - Playable CharacterBow Wow the Chain Chomp (The Legend of Zelda: Link's Awakening DX - 1998)
Ridley (Metroid - 1986) - Subspace Emissary BossSylux (Metroid Prime: Hunters - 2006)
Noxus (Metroid Prime: Hunters - 2006)
Weavel (Metroid Prime: Hunters - 2006)
Peppy Hare (Star Fox - 1993)
Slippy Toad (Star Fox - 1993)
Krystal (Star Fox Adventures - 2002) - TrophyWolf O'Donnell (Star Fox 64 - 1997) - Playable CharacterDiddy Kong (solo) (Donkey Kong Country - 1994) - Playable CharacterDiddy Kong & Dixie Kong (Donkey Kong Country/Donkey Kong Country 2: Diddy Kong's Quest - 1994/1995) - TrophyKing K. Rool (Donkey Kong Country - 1994)
Ninten (Mother - 1989)
Paula (Mother 2 [EarthBound in the U.S.] - 1994 [1995])
Jeff (Mother 2 [EarthBound in the U.S. - Assist TrophyPoo (Mother 2 [EarthBound in the U.S.] - 1994 [1995])
Claus (Mother 3 - 2006)
Lucas (Mother 3 - 2006) - Playable CharacterPrincess Kumatora (Mother 3 - 2006)
King Dedede (Kirby's Dreamland - 1992) - Playable CharacterLololo & Lalala (Kirby's Dreamland - 1992)
Marx (Kirby Super Star - 1996)
Jeigan (Fire Emblem: Ankoku Ryuu to Hikari no Tsurugi - 1990)
Oguma (Fire Emblem: Ankoku Ryuu to Hikari no Tsurugi - 1990)
Nabarl (Fire Emblem: Ankoku Ryuu to Hikari no Tsurugi - 1990)
Sheeda (Fire Emblem: Ankoku Ryuu to Hikari no Tsurugi - 1990)
Maji (Fire Emblem: Ankoku Ryuu to Hikari no Tsurugi - 1990)
Saji (Fire Emblem: Ankoku Ryuu to Hikari no Tsurugi - 1990)
Sigurd (Fire Emblem: Seisen no Keifu - 1996)
Ike (Fire Emblem: Path of Radiance - 2005) - Playable CharacterSoren (Fire Emblem: Path of Radiance - 2005)
Mia (Fire Emblem: Path of Radiance - 2005)
The Black Knight (Fire Emblem: Path of Radiance - 2005)
Gardevoir (Pokemon Ruby & Pokemon Sapphire - 2003) - Pokeball PokemonSteven Stone (Pokemon Ruby & Pokemon Sapphire - 2003) - Pokemon Trainer is close enough, right? =3Black Shadow (F-Zero X - 1998)
Palutena (Kid Icarus - 1986) - Pit's Final SmashMedusa (Kid Icarus - 1986)
Eggplant Wizard (Kid Icarus - 1986)
Isaac (Golden Sun - 2001) - Assist TrophyFelix (Golden Sun - 2001)
Little Mac (Punch-Out!! Featuring Mr. Dream - 1990) - Assist TrophyDragon Chan (Super Punch-Out!! - 1994)
Banker (Mario Paint - 1992)
Ray 01 (Custom Robo - 2004) - Assist TrophyCaptain Olimar (Pikmin - 2001) - Playable CharacterHuman Main Character (Animal Forest - 2001) - Smashville stage backdropTom Nook (Animal Forest - 2001) - Smashville stage backdrop & TrophyChibi-Robo (Chibi-Robo! - 2005) - TrophyHarry the Robot (Teleroboxer - 1995)
Doctor Wright (SimCity - 1991) - Assist TrophyMuddy (Mole Mania - 1996) - Assist TrophyThe Blue Virus (Dr. Mario - 1990)
Urban Fighters (Urban Champion - 1984)
Lip (Panel de Pon - 1995)
Furil (Nintendo Puzzle Collection: Panel de Pon - 2003)
Takamaru (Nazo no Murasamejou - 1986)
Demiru (Tomato Adventure - 2002)
Tomato Robot (Tomato Adventure - 2002)
Sukapon (Joy Mech Fight - 1993)
Donbe (Shin Oni ga Shima - 1987)
Ayumi Tachibana (Famicom Tantei Club Part II: Ushiro ni Tatsu Shoujo - 1989)*
Jill (Screw Breaker <Drill Dozer in the U.S.> - 2005 <2006>) - Assist TrophyIppongi Ryuta of Cheer Squad (Osu! Tatakae! Ouendan - 2005) - TrophyHero/Heroine (Magical Vacation - 2001)
Professor Kawashima (Brain Age: Train Your Brain in Minutes a Day - 2006)
Master Hand (Super Smash Bros. - 1999) - BossCrazy Hand (Super Smash Bros. Melee - 2001) - BossGolden Sun characters
Advance Wars infantrymen - Assist TrophiesFamicom Tantei Club characters
Third Party Suggestions From Sakurai's ListMega Man (Capcom) (Mega Man - 1987)
G-Red (Capcom) (Gotcha Force - 2003)
Simon Belmont (Konami) (Castlevania - 1986)
Power Pro-Kun (Konami) (Jikkyou Powerful Pro Yakyuu '94 - 1994)
Lupus (Rare) (Jet Force Gemini - 1999)
Geno (Square Enix, Inc.) (Super Mario RPG: Legend of the Seven Stars - 1996)
Mallow (Square Enix, Inc.) (Super Mario RPG: Legend of the Seven Stars - 1996)
Sora (Disney/Square Enix, Inc.) (Kingdom Hearts: Chain of Memories - 2004)
Magnus Gallant (Quest/Nintendo) (Ogre Battle 64: Person of Lordly Caliber - 2000)
Princess Katia (From Software) (Lost Kingdoms - 2002)
Kalas (tri-Crescendo/Monolith Soft) (Baten Kaitos: Eternal Wings and the Lost Ocean - 2003)
Thomas the Kung-Fu Master (Irem) (Spartan X [Kung-Fu in the U.S.] - 1985)
Japanese Poll, Most Requested Characters in JapanKing Dedede(5)
Diddy Kong(4)
Geno(4)
Ike(4)
Ridley(4)
Captain Olimar & Pikmin(3)
Krystal(3)
Takamaru(3)
Windwaker Link(3)
Animal Crossing MC(2)
Claus(2)
Demiru(2)
Isaac(2)
- Assist TrophyJeff(2)
- Assist TrophyKawashima(2)
King K.Rool(2)
Lip(2)
Lucas(2)Mega Man(2)
Oguma(2)
Ouendan(2)
Sukapon(2)