Starter character

A starter character is a character who is available for play immediately after turning the game on for the first time; the player does not have to unlock or challenge that character in order for him to be selectable (as one must do to select unlockable characters).

Super Smash Flash 2
Super Smash Flash 2 is still under development, so no characters have been confirmed to be starter. It is likely that most characters in the demo will be starter, though.