Remember, these are my personal headcanons, and aren't actual canon (or at least not confirmed)!

Wilbur's mom is Kristin, but she went away when he was really little, so he just made up the whole "my mom is a fridge" thing to make up for the whole "no mom" thing

Wilbur kept calling Techno his brother because he was an only child, and since Techno was the only kid his age there, he made up the family dynamic

Wilbur ran away from home when he was in his teens after Phil grounded him, and he stumbled upon Little Tommy and Little Tubbo and basically adopted them

Wilbur would've died for Tommy, even as he blew up L'manburg and after he was revived

The night before Wilbur's death, him and Techno had a conversation while he watched Tommy sleep, and basically Wilbur tells Techno that he knows that he can't get better, and that he'd rather die than let Tommy become even more scared, and asks Techno to take care of Tommy after he's gone

Alivebur doesn't necessarily feel guilty for blowing up L'manburg, but he does feel remorse when he first made eye contact with Tommy when he was revived

Whenever Phil isnt home, Wilbur looks at the picture of Tommy and Wilbur at the beach (the one that Phil has in his house), and cries

Wilbur didn't exactly hate Fundy, but he also didn't exactly love him, especially when he got older.

c!Wilbur is bi (and I have several things backing this up)

I have enough Wilbur headcanons to make a very angsty fic surroudning him, I'm not even kidding