I spent like an hour going back and forth about whether to keep the original spelling, number, and multiple underscores in my old name because that was just how my main always was and I haven't had a non-numeric handle in decades.
Suddenly realized the sheer specificity of it meant googling my user could easily find the most ancient stuff, got creeped out, dropped it immediately. Now all anyone who tries to find me is getting is Victorian era poetry and pictures of plants.