Thanks to FusionFall (and mildly Ego Trip), Dexter has been seen as Badass Bookworm and a charismatic leader of men.
Quite a few fans believe Dexter has Asperger's syndrome, or something similar.
Likewise, one could argue that Dexter's Mom has a form of OCD, especially if the Mother's Day episode and the episode where she was dating his dad when they were teens is anything to go by.
Even Dee Dee is often seen as having a form of ADHD.
How much of this show is just happening in Dexter's head? The constant Reset Button could be an indication of this.
Is Dexter actually the smarter sibling, or just the more motivated one? There are plenty of episodes that indicate Dee Dee actually understands all of Dexter's technology (sometimes better than Dexter does), she just doesn't have the inclination to put her knowledge to use.
Considering the somewhat unethical nature of some of Dexter's experiments opens up another can of worms entirely. Does Dexter have a darker side, is this the normal scientific train of thought, or is Dexter just a young and somewhat naive kid whose moral compass is still being formed?
Is Dee Dee an intentionally annoying sibling, oblivious to how annoying she can be, or is she just a sister who wants to bond with her nerdy, introverted little brother? A little of them all? Even the show itself varies on her.
Is Dexter truly tormented by his sister? Or is it really his own inflated ego causing him problems? Dexter fancies himself as some kind of genius but for some reason he makes some of the most ridiculously flawed and impractical inventions that are easily destroyed by Dee Dee. In the same note, is Dee Dee tormenting Dexter for lulz, or is she really trying to teach him to improve as an inventor/designer and see the flaws of his own designs that he ignores (or outright refuses) to see due to his own ego? Consider "Dexter's Assistant," in which Dexter makes Dee Dee intelligent and articulate so she can be his lab assistant, only for him to ignore all of her (correct) predictions that his experiments will fail and suffer as a result. He even takes his anger out on the Cymbal-Banging Monkey that she gives him before leaving!
In "Dimwit Dexter," are the neighborhood kids pointing and laughing at Dexter's mental breakdown-induced stupidity or are they entertained by how off-the-wall his antics are? Consider how they both chant his name and cheer when he kisses a duck's butt at the end.
The nameless Voiceless creepy eyed girl from "Aye Aye Eyes" has a crush on Dexter and Dexter assumes that if he doesn't become her boyfriend she would tell everyone about his secret laboratory despite the fact the girl never speaks in the entire episode. Question is that is she really mute or is Dexter not taking any chances in case she really does talk.
At the end of "Just An Old Fashioned Lab Song", was Dexter really putting up a facade of learning to appreciate music so he could get Professor Williams out of his hair in a way that didn't look rude or did he geniunely enjoy their duet but let his previous attitude get the better of him?
