When you complete the following tasks the corresponding playable character will become available.
Complete Chapter 1
To unlock Garam simply complete his challenges.
Complete her challenges at the beginging of the game.
Get a 'Jet' ranking on ALL of the Kogane-cho levels.
Unlock Gum and complete the challenges Tab gives you afterwards.
Unlock the Love Shockers, Noise Tank, and Poison Jam gangs, then complete ALL the Grind City levels with a 'Jet' rank.
Love Shockers, Noise Tanks, Poison Jam, and Goji:
Beat the game with a 'Jet' ranking in ALL stages. This includes regular stages as well as Golden Rhino stages
Beat ALL the Benten-Cho (aka City of Night) levels with any ranking. Mew will then challenge you. Win ALL three of her challenges to unlock her.
Complete the game with the 'Jet' ranking on ALL the levels including Story mode and the basic areas.
Play through the game until Slate challenges you to a race in Kogane-Cho. Beat him to unlock.
Progress through Story mode until he challenges you. Then complete his challenge to unlock him.
Added by: Sanzano Sep 25th 2012, ID#4897