In role-playing games RPG, this is the "player character" or "playable character."
A player character being your personal controlled character, and playable character should be pretty obvious.

A video game experience so good it's almost orgasmic.

onomatopoeic term for when a golf ball sits in low but loose rough. the ball is playable - but just.

Skin Flute is an Android app that turns your mobile device into a playable instrument. You can choose what skin you want to play. Then by blowing into the microphone while, using your finger to slide between notes, you can play simple songs.

A type of black tea originating in Fujin, China. And yes, it IS a playable word in Words With Friends.

Globox is a creature that resembles an amphibian, and is blue (though according to the game Rayman Origins he was previously red). He is a Glute (a species of his kind) and has a wife (Uglette) as well as more than 650 children. He was created by Polokus ( the Bubble Dreamer) who is the creator of their world: the Glade of Dreams.
In the Rayman series, he is portrayed as Rayman's best friend, who he extremely loves, and helps him whenever he is in need of it.
His appearance is fat and blue (as said above) with a pale belly (as well as pale coloured hands) and eyes at the top of his head.
In terms of character he is adorable, helpful, quite dim, friendly and shy. He is also a coward and runs away when he finds himself in the presence of enemies such as Robo-Pirates and Hoodlums, but is very confident under the influence of Plum Juice (which he is ironically allergic to).
Despite not being 'magical', Globox has other astounding abilities. He can...

Arabian Fight, arcade game. Abbreviated form first used by the MAME project.