As you may know, the majority of the cast is unlockable.
A handful of them had just one appearance as as starter character. Note that I count both versions of SSB4 as one game.
Here they are:
64 veterans:
Luigi (SSB4)
Jigglypuff (SSB4-Wii U)
Melee veterans:
Marth (SSB4)
Ganondorf (SSB4-Wii U)
Brawl veterans:
Wario (Brawl)
Squirtle and Ivysaur (Brawl, part of Pokemon Trainer)
Lucas (Brawl)
Lucario (SSB4)
Toon Link (SSB4)
SSB4 veterans:
Bowser Jr. (Wii U version on;y)
Rosalina & Luma
Greninja
Robin
Little Mac
Palutena
Villager
Wii Fit Trainer
Shulk
Mega Man
Pac-Man
A handful of them had just one appearance as as starter character. Note that I count both versions of SSB4 as one game.
Here they are:
64 veterans:
Luigi (SSB4)
Jigglypuff (SSB4-Wii U)
Melee veterans:
Marth (SSB4)
Ganondorf (SSB4-Wii U)
Brawl veterans:
Wario (Brawl)
Squirtle and Ivysaur (Brawl, part of Pokemon Trainer)
Lucas (Brawl)
Lucario (SSB4)
Toon Link (SSB4)
SSB4 veterans:
Bowser Jr. (Wii U version on;y)
Rosalina & Luma
Greninja
Robin
Little Mac
Palutena
Villager
Wii Fit Trainer
Shulk
Mega Man
Pac-Man