Why does Tobi have to be someone?
Why can't Tobi just be Tobi? >.< Oh, and there might be spoilers. Now go read the manga, if you haven't already.
Hate to add to the Tobi threads, but I'd like to actually get some opinions on this, rather then the idiotic, unreasonable rabble that people spit at me when I contradict their Tobi = X theories.
Anyways, why should tobi have to be a character who has already been significant in the plot? It's way more likely that he's an Uchiha who was either vaguely referenced, or not referenced at all.
I can't be asked to go search for every obscure Uchiha, so if you know any, post them here and they shall be discussed.
Edit: It's been brought up that Tobi may not be an Uchiha at all, as his sharingan is always activated. For some reason, this didn't even once occur to me. +Rep to the people who brought it up. I guess it adds that much more mystery to the man who is TOBI.