Someone here or on the FB group mentioned science fiction Halflings.
I got out my own Halfling militia kit to do some head and arm tests; Stargrave male crew arms are too big, except for that one weird short pointing left arm. Some female crew arms are okay. But what actually works best are historical kits that aren't exaggerated too much.
Of course, if you are making aliens, short body and big arms may be the look you're after!
Below: Stargrave male head and left arm, female right arm; Stargrave male arms and chimp head from the mercenary sprue; Perry dismounted Dragoon carbine arms.