Sidearm. That's about it for that set specifically. I suppose you could use PE The Sun and The Night with it, maybe PE Ejector and Rewinder...
arent there also a alternate set of gold chromed color add on parts for hot rods car mode rear mounted wing sthing? and what about the reprolabels decal sets and that targetmaster guntroid hotzone hot rod miniclone target master? anythine else red and gold colored flame themed that looks like it cold blend in real well with the protector upgrade kit as additional add on weaponry?
^Nor would I want to arm Protector with itself in gun form. It's like using the mini-Prime headmaster on a Prime... That's just weird. Shadow Commander is the one that got all the attention for unique type add-ons, and that's because "nemesis" and "black repaint" are really easy to do. Besides what was already mentioned, there isn't much of anything to go with "red and flames".
perfect effect sundor looks like he could make for a good beast style targetmaster turbohawk partner as well