What @mawibblap said! ♥
Provided you have something that could count as "evidence" that really is a tried and true method.
The best proof I can see think of right now: If you still have access to the account on continued-exe.fandom.com that you used to create your character's page there ( https://ngrasi.newgrounds.com/news/post/1405530 ), you could write something with it to confirm it for Mr. Fulp. (Maybe on that character's talk page?)
mawibblap
you can pm @tomfulp (with proof.) in order to try get your old account back, that's how I managed to get my main account back when I was first locked out of it.