"This little blue robot was send to JNK-6 because on his home planet his function was replaced by a single robot. Because of this he thought he no longer had a purpose and didn't care to be send to a junkyard planet. To his surprise he found a that there was a whole organized society on JNK-6 and that every robot had a purpose. After he met Sensei he started to repairing damaged and older robots finding a new purpose in his existence."
His legs can't bend, the model itself is more for display purposes only instead of playability (as can be seen in the second last picture).