I made a chart of all known characters

[Guybrush20X6]

I was bored to I made this chart showing how many characters are in a series, their first game and unlock status.

What I've found by game. (For the record, an unlockable series is one that has it's assets hidden until unlocked and with exception of 3rd parties isn't used in advertising.)

64
8 Original characters and 8 series
4 Unlockable Characters and 2 unlockable series

Melee
4 starter Newcomers and 1 new starter series
9 unlockable newcomers and 2 unlockable new series

Brawl
9 new starter characters and 3 new starter series
6 new unlockable characters and 3 unlockable new sereis