What is a realistic scope for a solo dev?

I have a computer science degree and a bit of experience in web and application development, so I'm proficient at programming, but I'm not super experienced in making games. I'm a huge fan of fighting games and I've wanted to make my own for some time now. As I have never made a serious game before, I don't really know what is feasible to accomplish on my own. Is a paired down version of a game like Smash Bros or Guilty Gear with around 6-8 characters a realistic goal (excluding online play) or should I set my sights on something smaller?