It's not the fact that characters were in animes, it's the fact that the characters aren't really videogame characters. When I think of Naruto, I don't think of videogames. I think of manga or anime. Same with Goku, Ichigo, etc. This game celebrates Playstation, and furthermore, videogames. It's like sticking Spider-Man or Deadpool (shots fired) in it. They don't fit. Why? Because people see them as movie or comic characters. Let's take Dante and Spike. They were in animes. However, they originated as videogames, became popular as videogames, and are known as videogame characters, NOT anime characters. That's why people don't want them in.
Other than the fact that 90% of anime sucks, of course.
We don't want them because they simply just don't belong in here.
This is Playstation all stars, not some console version of MUGEN.
I'm sure a fair amount of us would love to use a Lvl 2 Goku spirit bomb on Naruto, but it just doesn't belong.