I don't think I have enough time to explain some stuff in the game, but I'll just do it in Instructions. Beebo was originally a green smiling robot with dark green hands and a purple block as his torso and a wheel on the bottom of the torso. Then, Beebo got changed to a different robot that now we all know as Beebo. But, in the concept art, Beebo had hands and only 2 batteries in his battery pack instead of four. And, Beebo also had some unused movement stuff in the concept art such as Super Mario 64-like jumps, such as Mario doing single, double, and triple jumps, and duck kicks, jump kicks, and punching. Later, the game was in development and Beebo's first appearance was a Robloxian with a small torso with no limbs and a purple O on his head. Then again Beebo went to another change. Beebo was a robot..but not really since his legs and shirt were just ONLY blue, and his arms were a little bit down. Later, Beebo got changed to the v3 pixelated Beebo that looks like the one we all know, and skins might have been planned in the game's files because in some more early versions, the skin was a yellow version of Beebo with a miscolored arm and an EARLY pixelated face..AND THERE WAS A VIS IN V15 WHICH KIND OF LOOKED LIKE A SECOND BEEBO CHARACTER. Pixelated Beebo lasted in versions v2-v75, and Beebo went through another change in v78. This time, in v80, Beebo's meshes and textures were changed, and Beebo's face was a little off. In versions v151 and later, Beebo's moveset and other stuff are changed to the stuff we all know. OH I FORGOT! In some versions of the game, Beebo could be found with a green battery cap instead of a blue battery cap.
Credits to zKevin for Robot 64. I do not own ANYTHING whatsoever and I did not make Robot 64. Check out Instructions to see my yappatron machine working