To celebrate one year since GIBZ released out of early access here are all the secret codes that you can type while making a character (or using the Character Customiser bought from the Travelling Merchant).

Simply type a code as your name to change to that head (you can change your name afterwards).

Using the "dexbonus" head also unlocks the Fox Kigurumi outfit. You can also type "dexbonus" into the game's chat while in singleplayer to unlock it, then equip it by buying a shirt from the shop. There is both a Female and Male version.