If you're missing basic stuff like how the show made it clear he was a pedophile and what the device was, I don't know if you're paying enough attention to be criticizing it. She straight up said the device was his camera jammer and that he was the guy Nathan was talking about from Thursday. A guy who grooms kids like that and lies about it to a kid's mom and has a camera jammer is not a good dude. He probably picked a secluded area away from passers-by for his own evil ends.
Bernard's marble/pearl is flecked with red, indicating he's partly human. Unlike regular host pearls, which apparently are just grey and black.
Then again, why in the world would robots know what their pearls look like?
She doesn't have Charlotte's memories easily accessible to her or she would have known the secret code to contact Serac right away, as well as knowing real!Charlotte was a mole for Serac. But she did say she felt like real!Charlotte was trying to break free. Maybe that's just the dissociation of being in charge of a body she doesn't recognize. Kinda like how in Altered Carbon people's minds can be placed into new bodies and sometimes doing so too often can damage the psyche.
But depending on how the host bodies are made -- and the claim that modern host bodies are as organic as human bodies (minus platelets and hormones like adrenaline or cortisol, which is another wildly lunatic idea) -- maybe host!Charlotte was literally cloned/fast-grown/molecularly duplicated. And if it was the latter, then host!Charlotte has a brain similar to real!Charlotte, with the memories and mind intact, but the pearl and lightbulb are driving the body. (I guess we'll have to ignore that doing so means there's a big hole in the host brain to make room for the lightbulb.) Anyways, in which case this makes it a kind of homage to Get Out as well.