As I scrolled down on this, my eyes instantly caught notice of an ADHD tag in the Credits & Info section. I feel obligated to say somethin' like "Hello fellow neurodivergent artist!" 'cus for me, it's a surprise to bump into other neurodivergent people online; and in regards to Aiden's explicit purpose as a character, it adds a lot of relatability to some of the mental health struggles she embodies.
With that mini-ramble aside, time for me to do some actual critiquing. Since ADHD's been mentioned, I'll start off with Aiden's name; I love it. It took me speaking her name outloud in my head to realize that her full name's a somewhat subtle corruption of the pronounciation for ADHD, which is some great attention to detail without being *too* on the nose about it. Without that context, I doubt most people would surmise what Aiden's full name is supposed to mean.
Now, as for her design, I like it as well. For a vent character, she doesn't come off as overwhelming edgy, which is apparently a common trend amongst these types of OCs; I'd say she'd look right at home in some location reminiscent of psychological horror games like Silent Hill 2 or In Sound Mind. I can imagine Aiden would likely be in need of a hug or some positive affirmations.
The only part of her design that confuses me a bit is the bloodstained slab of metal. The third image has me thinking its supposed to part of some torture device, while the first one makes it appear as a weapon that Aiden could use as a form of self-defense. If the latter is true, I think the metal slab having a makeshift handle on one side would make for a relatively decent sword design.
And that pretty much sums up my thoughts on this character. Overall, she's a good OC in my eyes; has a great name and a horror-esque design that doesn't fall on edgy OC tropes from back in the day when those were popular.