The forgotten

The forgotten (also known as ???) is mostly seen as a villain of Ewo's Horrible Adventure who appears in Part 11: him?. Who says that he was forgotten in the void of reality and gets his revenge on Ewo as well as Ewo's friends (Baby Steve, Sam, and Dad).He says he might look like Nova, but they are completely different people.

Lore
He is secretly Old Nova (from Nova part 1-5). He was once forgotten by the servers of reality and was locked in the vault, never to be seen again. For years apon years of being in the void, Ewo and his team go into a house in the village and set him free. He talks to them saying he was forgotten. He then fights them and beats them. But then Frisk from Undertale helps Baby Steve beat ???.