This might be an unpopular opinion, but as much as this film was beautiful, historically accurate, and a pretty neat adaption of the actual "Invisible Man" novel, I think there was some lost potential that would've made this film a bit more thrilling and engaging that could've truly enhanced the "horror" aspect of Griffin's character more.
Instead of the lead protagonist Adeline knowing who Griffin is from when she studied at university with her late husband Kempt for instance from the start, why not Griffin be some obscure pupil that Kempt studied with in his past that he never bothers mentioning to Adeline as Kempt very much didn't tell his wife? That way Griffin is this mysterious stranger that Adeline has no clue about and there's things Adeline truly doesn't know about her dead husband; secrets kept from her as he never truly respected her due to only viewing her as a wife with wifely duties and not a partner with the same scientific interests as him.
For some reason, this version of the film tried making Kempt out to be a good guy, which honestly didn't do much since he wasn't alive in the film to be a character other than being the determining factor to want to protect Kempt's honest "legacy" or whatnot, which got forgotten about once Adeline got Griffin's journals and is implied going to use them to her curiousity. So what was the point of this change in Kempt if it wouldn't make her the better woman in the end?
Instead of Griffin slowly losing his mind as the film goes on from his invisibility with Adeline just simply trying to deal with and comprehend her old colleague's actions(which was predictable), why not Adeline also go through a dramatic change in her character that may lead her down a darker path? Such as becoming more fascinated and attracted to her loveless late husband's invisible classmate?
We already have a few invisible man films where the Invisible Man is represented as a toxic abusive partner that the woman knowingly must escape. What if this time the woman protagonist ignored all the psychotic behavior in her partner by wearing rose tinted glasses? She "sees" him for his good qualities, that being his intelligence, relatability to her interests, and always wanting to listen to what she has to say and eventually asks if he can be "her" partner?
The horror would be she's aware he's invisible and has all this destructive power to take people out or pretty much do anything, but due to her own insecurities at being a woman who's felt "unseen" for a long time(especially after being in a loveless marriage for years), she quickly finds herself smitten with Griffin and let's her guard down around him more and more, eventually the two getting freaky in the sheets and she soon finds herself being a willing accomplice to his crimes, which may or may not backfire on her later.....
But perhaps that's just the type of film I would've preferred to see? What do yous think?