What are some of the differences between original William and your William, both before and after destruction?
Thank you for your curiosity!
(technically this kind of ask should have gone to @ask-voidverse but it's not too big of a deal)
This is more of an info dump than a comparison, but this'll still get the idea across (hopefully)
William is largely the same. The most notable difference is the fact that he's more shy in the beginning.
I suppose he's also a little more friendly than his original variant too.
After Destruction: (I have not reached this point in writing [VOID]!Alphatale, so things might change when I do)
I decided to also cover relationships, because yes.
William is closed off and quiet. Unlike his original variant, William is actually quite sympathetic and emotional, but tries to hide it
404 isn't nearly as busted in my variant. I've limited his power from being able to destroy entire universes, or even hyper verses, to now being a planet buster, or at his most powerful, being able to destroy a universe. Still incredibly broken, but not as bonkers as original 404.
Skipping to the beginning of New Puppet Book 1, William has fully lost who he was. William is a name he only ever hears in his nightmares. As 404, William tries to build business relationships with others. Treating Error and Root (my own character) as more of assistants than underlings (Root acts more like his child than an assistant tho). Seraphim and King Multiverse are treated closer to slaves with no purpose other than serving him, which is pretty similar to normal.
At some point, 404 will also recruit Fatal_Error, using Fatal's immense desire to bring his Papyrus back as leverage to call on him when needed. Feeding him small amounts of Papyrus code every time they work together, but he knows Fatal won't be happy with any Papyrus he makes, so he considers Fatal a semi permanent member of the crew with little chance of leaving. He'd be willing to take control of Fatal like he did with Seraphim if the need arose.
Bill!Sans is kind of like a convenient nuisance for 404. 404 does hate him, but he appreciates the times Bill has helped him out of a weird spot and pays him back on occasion.
404 keeps a more public appearance as opposed to his more secretive nature in cannon. He constantly keeps people like Nightmare, Ink, Core, and Shattered Dream aware of his existence in an attempt to either keep them from getting in his way, or even have them consider assisting him in some endeavors.