1.Rouge likes Knuckles
2.Shadow is a loner
3.Rouge is più of a golddigger, Shadow just wants revenge, I don't see that as a couple.
4.Rouge is a bit of a traitor, because she was giving information to the government about Shadow(sonic adventure 2)
5.In Sonic heroes, at the final cutscene, she just left Team Dark to go after the Master Emerald
6.Shadow is too cool for Rouge! XD
7.If Shadow was to end up with anyone, it would either be a fancharacter o Lein-da(in my opinion)
8.If Rouge really loved Shadow, she wouldn't be fighting with Julie-su over Knux all the time!