Better late than never ....
What he needs is a nerf head that is more squishable.
Visco-elastic polymers would be the solution since they absorb a lot of energy without imparting much of it back to whatever collided with it in the first place.
Maybe this is the reason why both girls thought his head was of the squishy variety.
Pintsize lacks such a covering that could be deemed normal for a consumer version of his model type but is not standard issue on a military grade chasis.
Eyes? Mine are blue or bluish and I have on again off again contemplated contacts for cosplay but touching eyeballs freaks me right out even though I get no qualms with peeled grapes.
Now cybernetic eyes would require major surgery and such but the concept has the techno-geek in me squee just a bit with all the possibilities of machine / cyber vision.