Is it possible to rotate hair (object) in timeline? I'm trying to animate bugs over my character and can't seem to move them in the timeline using hair particle settings. Could anyone give me advice?
I'm not sure how well this technique can be adapted to your situation--it looks like your bugs are largish objects, and I think getting the rotation correct (so the bugs are correctly oriented to the surface) might be hard with any particle system solution.

But if it's useful to you, I can explain how to get an effect like this one:



The bugs are small symmetrical objects (icospheres) that move using brownian motion and are confined to essentially the surface of the sphere by invisible collision objects (also spheres) just below and above the desired "shell" of motion.