The rules for the Subspace categories list "No character", and I wanted to make sure I understood what that means before I start trying to run this. Sorry if this is answered somewhere else. I couldn't find it :|

It means that you don't need to give a character in when you submit a run for subspace, because you use almost all characters in the mode, so adding in the character you used wouldn't make a whole lot of sense

This applies to other categories as well, it's just there for certain categories. (i.e. All-Star, Classic)

That makes sense. Thanks.