Zuhl3156
Nah, Kellogg had a Stealth boy and so do some of the Synths but other than that no other invisible enemies for me.
With a Stealth Boy in previous Fallout series I was always able to see the "invisible" target. It was harder but the outline was there. In this case you see absolutely nothing other than your hit points going south. I am also not aware that Ghouls and more so Rad Roaches use Stealth Boys. But if they do it is going to be a long campaign. LOL I should also add that when the Roach was attacking me it was invisible and appeared only after Dog Meat killed it.