Today I am thinking of a game called Pop'n Music Pico 8 edition. It's just like Pop'n music GB, but with more techniques.
Here are some characters that need to be in the game.
Akane [LT] (2P)
ALT 2.0 
Fukagawa Funawo 
Guwanzesama [portable 2]
Kanta  (2P)
Miyu [LT] (2P)
Nornir [pe] 2P
Oni-Be  (2P)
Purecul Lip 
RGB  2P
Yima  2P
Zizz  2P
Today I am thinking of a game called "Puyo Puyo: Pico 8 edition". It will be like Magical Drop F.
Here are examples of characters that will have designs during the development of the game.
Hito Inu (Yes he is a Madou monogarati character)
Succubus (Puyo Puyo Quest style)