Board Thread:Speculation, Theories, and Rumors./@comment-6362372-20131024111232/@comment-477304-20131031153722

I think Rouge and Knuckles are more likely, the fact that Shadow and Rouge are team mate doesn't really mean anything (also, Rouge and Knuckles are known to team up on occasion). The way I see it, Rouge may have a slight attraction to Shadow, with may be considered romantic, but Shadow hasn't really shown anything to Rouge other than friendship. Honestly, I think Shadow is too distant and driven to have any romantic relationship.

As for Rouge and Knuckles, they appear to me to have a strong love-hate relationship, and in Sonic Adventure 2, it implied that the two may have mutual feelings for each other. But that's just the way I see it.