Still, it's too hard to make one team Light-exclusive.
That's what I figured your answer would be. MM1/PU and MM9 isn't much to work with...
Also, there's classes like Soldier and Demoman that have too many Robot Masters to choose from...
Well, let's see if we can't narrow it down...
Soldier has a decent speed, and if you aim well, he can be devastating. Essentially, he's a rusher. Which Robot Master(s) fought you in this manner?
Maybe if the MM3 and MM6 RMs can be counted as Light's team. On MM3 he helped to build them and on MM6 they were being controlled.
For Soldier...Drill Man: there's the Drill Bomb and the puns with the Shovel and for being a
drill sergeant.
Grenade Man: self-explanatory, personality and all ("Pain doesn't hurt!").
Yamato Man: suggested after his custom Kabuto hat, the Concheror and the Half-Zatoichi.
Commando Man: self-explanatory as well.
For Demoman...Napalm Man: his love for bellical gear and his Napalm Bombs (they act almost exactly as Demo's Grenade Launcher).
Pirate Man: a one-eyed pirate with an explosive weapon. Also, you know, pirates and rum.
Knight Man: hailing from UK, there's the "Demo-knight" class too...
Also, there's no "direct replacements" for Auto on Wily's side instead of the own Dr. Wily... and that's unfitting.