Characters in TUG are called Seeds. Seeds feature a blue gem embedded in the back of their left hands. Player-controlled Seeds start as children, later maturing through adolescence to adulthood. Through their lifetime, Seeds acquire physical features and attributes depending on their consumption. For example, a Seed who eats lots of food will end up becoming that much heavier, whereas a Seed who doesn't eat will be visually slimmer. Depending on how old the seed is, they can also equip different pieces of clothing.
Customization of seed appearance is randomized however there are plans to give players more control over this.
Seeds aging currently relates to how much they've experienced. In order to grow up, the Seed must craft, hunt and eat; All of which grant experience. For the moment, dying simply respawns the seed at the same age. There are plans to change this.