Now to talk about Timmy.
I don't know where to start... First, there is Cleft, the Boy Chin Wonder. Since the Crimson Chin exists in this world, Timmy could meet him, and let's say... Crimson Chin gains medium awareness at some point for different reasons, and Timmy restores his hope and stuff, and Chin trains Timmy to become his sidekick. That, in and of itself, makes sense...
But then there's the whole "magic" thing, and having fairy godparents. That's like, the most important thing about Timmy as a whole. And, I just really love how in Abra-Catastrophe, Timmy gathers up all of the magical items he got for the Fairyversary party, and uses them all to fight. I just LOVE how he looks in that white cloak. And then there's the Masked Magician, where he officially becomes a superhero with magic powers, and in the episode it was sort of like a "graduating from Robin to Nightwing" scenario, when he was talking to Crimson Chin about it. Oh, and how can I forget, in Wishology he becomes "Turbo Timmy" by gaining the powers of Turbo Thunder. Oh, oh, and then there's the fact that he's wished for Heat Vision, and Spider-powers.
If we add all of that together, and... Oh my gosh... how strong is this kid?! And... how can it all be tied together if he's in a Superhero universe?
Let's say he gets Cosmo and Wanda like in canon, and then some time later he gets to meet the Crimson Chin and becomes his sidekick. But after that, I don't even know.. I just know that he'd be at the center of the "magic" side of things in this world.
Going back to Mr. Crocker, the fact that Timmy has sort of played a part in his backstory is very interesting, especially in the context of this world. Dr. Croctopus would definitely be Timmy's ultimate arch-nemesis, or at least one of them... The fact that he's sort of like Doctor Octopus, who became the Superior Spider-Man and eventually became like a dark evil version of Spider-Man, is very fitting.