Avatars

You can change your avatar at any point by accessing your M-Linker and looking under Profile. You start the game with the male or female defaults. If you visit the Premium Shop, you can purchase up to 4 additional avatars for 100 diamonds each (as shown in the picture). Two females from Navia and Aera, and two males from Magma and Mineralia.

There is also a character named Edward whose avatar you can unlock by doing a "run this item here for me" quest and meeting him in Mineralia just outside the foreman's home.