Now there's a multiplayer game called "Tubbie party", here there 12 characters that are in the picture while other 12 are unlockble. It's a total of 24 characters (excluding alter ego, and clones)

PLA original:
Lurangel
Captain Yuron
Flappy
Malaria*
Drewron*

Mario series other:
Yoshi
9-Volt
Bowser*
Mario*
Ashley*

Neopets:
Kacheek
Cybunny*


Pokemon:
Pikachu
Jiggypuff
Lucario*

Kirby:
Kirby
King Dedede*
Wadle dee*

AirBurst:
BCM
Maya
Veng*
Abby*

Tamagotchi:
Violetchi
Kizatchi*

Alter ego*:
Super Yuron
Shiny Pikachu
Shiny Jiggypuff
Stary Kacheek
Golden Yoshi

Clones*:
Notched ear Pichu
Wadle doo
Boshi
Igglybuff
Raichu
Wiggytuff
Riolu

* = can be unlocked by defeating boss character, or obtained the buddy card

That's all for now!