Who are the Super Smash Bros brawl unlock characters?

Answer 1

Taken directly from GameFaqs.com

Captain Falcon - Beat Classic in 20 minutes or less then defeat him in the following match or 70 VS matches

Falco - Beat 100-man brawl or play 50 VS matches

Ganondorf - Clear Classic on Hard with Link or Zelda OR play 200 VS. matches

Jigglypuff - Complete Classic Mode with any character other than Ike or Complete Event Match 20 or 350 VS matches

Lucario - Defeat in SSE with Meta Knight or Complete 5 Target Tests with any character or 100 VS matches

Luigi - Complete Classic Mode on Easy or 22 VS matches

Marth - Complete Classic Mode using Ike or 10 VS matches

Mr. Game & Watch - Beat classic mode with every character or 250 VS matches

Ness - Play five matches OR Reflect ten projecticles AND meet Ness in SSE.

R.O.B. (Robot) - Play 160 VS. matches

Snake - Play 10 matches on Shadow Moses Island or 130 VS matches

Sonic - Complete the Subspace Emissary or 300 VS matches

Toon Link - Finish the Classic mode as Link or 400 VS matches

Wolf - In the stage "Iseki" (Ruins) skip the first door you pass when being lowered in to the pit. Instead enter the second door at the bottom (REALLY HARD) or 450 VS matches

Contributed By: NostalgicX, Mrakainus, andrew214, IVIonith, patriot4829_V2, jakethepit, Sythe3o0, Mr_Funny, DevilMayBlowChunks

you can also get these people by playing the story mode, subspace emisionary.