Roger has the same anathomy as the other battle droids. His head, legs and left arm are brown like geonosis battle droids, his torso is dark brown and has the logo of the Freemakers on his back, and right arm is light brown.
R0-GR, nicknamed "Roger" is a B1 battle droid who served the Freemakers family. He was a veteran of the Separatist Droid Army during the Clone Wars, and was programmed to serve as Rowan's best friend. While sarcastic and pessimistic at times, Roger had a deep sense of loyalty and love for the Freemakers, whom he regarded as his family.
R0-GR was just one of millions of battle droids manufactured during the Clone Wars until the Freemakers found him rusting in a garbage heap one day. With a little paint and a small adjustment to his programming, “Roger” became the family’s faithful butler droid. His knowledge of old battlefields is very helpful for tracking down useful salvage, but as a butler he does tend to be a little accident-prone, not to mention nervous around anyone with a lightsaber.