great! so this guy is basically the patrick bateman of hollywood, he fell off the deep end after his big star-making franchise flopped and left him voicing a stop motion puppet instead of winning awards like he thought he would and now spends his nights on murder sprees and no one suspects him because he has the golden boy shtick down pat, not to mention enough money and influence to silence anyone who might be suspicious. for the assistant or publicist, it could either be a slow burn realization if they're newly employed and suspect something's off, or maybe they're even his partner in crime and that's how he always has an alibi which happens to be volunteering at the children's hospital as paddington or something else ridiculously twee. they could be actively into the whole murder thing or being blackmailed into staying in his employment for whatever reason, whatever gives us the most to play around with