An egxample that Rouge and Knuckles like each other is in SA2(Sonic Adventure 2) when Knuckles saves Rouge when she loses her balance and is about to fall into molten lava.
Rouge's appearence in most games and shows is a black jumpsuit with a heart on it. White boots and gloves, on the tip of her boots are also hearts though in Sonic Heroes and Sonic Riders she wears something different.
Rouge is also said to like Shadow the Hedgehog though I think it is a brother and sister relationship.
Knuckles holds Rouge's hand in SA2 after their battle! Hahaha! I bet non-belivers didn't know that...too stupid to get to that part of the game eh? I thought they were gonna kiss even! Oh and to ruin more-Shadow dies. Listen to theme tune though...oh and in Sonic heroes that Shadow is a ROBOT! hahaha!(oh btw I said "that" cuz Shadow breathes and cries in SA2-more spoilers! crying! hahaha! there's a boss called the biolizard!)
Knuckles: "WHERE AND HOW CAN SHE DO DaT WITHOUT BREAKIN THA LAW"
Shadow:"She is a government agent.. give her emeralds to see her though "