When Roboto was 5, he went to his brother's grave, and unfortunately these giant worm monsters with big spikes were coming to attack.  They attacked because they sensed that the Gods of the Green Tear People were coming.  Roboto was crying when the Gods found the green tear on his face, and they gave him even more special powers.  Now Roboto's powers were to build stuff with his mind, and to summon all the stuff he builds.