What creature, faction or character do you wish had more information on them? Mine would Personally be the Ghost People from NV Dead Money expansion, the mole miners from FO76(maybe terminal entry's or notes).
When you kill a mole miner and hide the other mole miners grief their death by huddling around the corpse(usually 2) checking on him,like a person would do if a friend or family memeber died in front of it. I also seen that super mutants are just huge green toddlers they say things like " NO FAIR NO FAIR"or when you die " now we got a little snack For later" just small things I seen