Ah, the good cyborg!  I like Lobot.  He might not be all that exciting to some collectors perhaps, but I've always kind of liked him, even if I did find his billowing sleeves to be a bit on the odd side as a child! 
There aren't that many variants to be found on this one, but there are some vest pocket, trouser fly and belt buckle sculpt and paint differences to be had.  Here are my 4 loose ones.  From left to right:
Kader L1a, R2a or R2b Figure, M2_2 Kader blaster - Wide pockets, long fly, narrow stance, gloss belt, 2 buckle circles
Unitoy L1a?(d?), R1a?(d?) Figure, M4c Unitoy blaster - Narrow pockets, short fly, fine details, narrow stance, gloss belt, 2 buckle squares
Smile 1a Figure, M1 Smile blaster - Narrow pockets, short fly, soft details, wide stance, matte belt, 2 buckle circles
Smile 1b Figure, M1 Smile blaster - Narrow pockets, short fly, soft details, narrow stance, gloss belt, 2 buckle circles