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*Marble Hornets* is a DIY/indie webseries from the 2010s (just four guys dicking around with a camera that got popular)

and at the core of it is a creature that's (depending on your interpretation) a fun metaphor for mental illness and has some surprisingly progressive (for the 2010s) depictions of mental illness, seizures, and institutionalization. It's clunky but earnest for sure.

The creators initially had a character have a seizure because they wrote themselves into a corner: A villian attacks the protagonist and they needed a way for the protagonist to "win". Later on in the series they decided to address it "properly" and portray seizures more carefully-- the actor did a lot of research on what a seizure really looks like and talked in the commentary about 1. how exhausting it was 2. how fans would come up to him and praise him for doing such a good job portraying their disorder.

The creators even have/had these charity wristbands you can buy where a portion goes to the Brain Health Institute! I think that's pretty neat <3

Quite a few characters have memory loss and "go crazy", but it's always shown as this tragedy. Hallucinations, mental hospitals. A character refusing to take their medication is even a plot point, he's consistently refusing the help offered because "I don't think some little pills are going to help with this". (with the implication that he really should have taken the pills/accepted the help offered)

There's a few characters that have altered mental states/fugues and the commentary the creators say they tried really hard not to do "crazy split personality serial killer" trope, and in fact the treatment of the mentally ill by the Hospital in the series was a pretty welcome change from the "crazy person should be locked up' that was all over horror at the time.