Nice quiz! It’s interesting to think about how many characters made their debut when I started playing video games. The only thing I’d suggest is organizing the quiz by year. I know that it’s organized by fighter number, but since the quiz deals with dates it would make more sense to have it ordered by release date.
The Hero from Dragon Quest debuted in Dragon Quest, which released in 1986. You could argue that since the default costume is from 11, he debuted from that game. However, that's like saying that Link debuted in 2017 in Breath Of The Wild, so I don't agree.