In Sonic X she does and a tiny bit on the comics but not so much on the games and further in the comics. In the comics she does tend to flirt around him and also she did once try to do a simple trick on the Master Emerald to show Knuckles that she can be a 'good girl' but seeing that Knuckles already has a girlfriend named Julie-su in the comics, she tended to flirt around with Shadow instead. In the game Sonic Chronicles she does admit to Sonic that she thinks Knuckles is cute but he's not really her type. In Sonic X it's shown that Knuckles is Rouge's secret crush, those two can be seen as a couple, mostly by 4kids Tv's suggestion about those two fighting all the time.
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Knuckles cannonly has feelings for her in Sonic Adventure 2 and in Sonic X, just as Rouge has also been confirmed to having feelings for him in these media as well.
look up knuckles and rouge some show them kissing.
No they aren't, mostly Knuckles and Rouge are seen as enemies. Rouge does in fact have a crush on Knuckles but Knuckles has doesn't have the same feelings for Rouge, Rouge says that he's cute when he's angry but Knuckles feels disgusted over that.
When Rouge is around Knuckles,Knuckles gets annoyed.But when Rouge is around SHADOW,He doesn't mind.But sometimes,Shadow gets a little annoyed. One of the main reasons could be that in the videogames the relationship between Knuckles and Rouge hardly consists on love interest, it mainly consists in rivalry. On the other hand, the relationship between Shadow and Rouge consists in something more than just friendship or partnership. Also, there is a lot of sexual tension between Shadow and Rouge (ex. Sonic Battle and Sonic Rivals) while Knuckles and Rouge don't even have that much interaction and they don't seem to be so interested in each other.
Yes in fact I think she kissed him! they do kiss but only in the Japanese version.
Her eye for Shadow:In Sonic Battle she called Shadow 'not bad looking' and 'a prince', in Sonic the Hedgehog 2006 she tries to talk to Shadow into another issue other than a plan to stop Mephiles and also told him that she'll always remain on his side.But SEGA rejected storyline of Sonic 2006, so Rouge didn't said it.In Sonic Heroes she currently wants to comfort Shadow about his problems when he escaped from his statis pod.Shadow doesn't shows any hints of interest in Rouge.Her eye for Knuckles:Knuckles in Sonic X they reveal that Knuckles was Rouge's secret crush there, and she flirts with him by teasing him and calling him 'Knucklehead' or 'Knuckie' (as a cutie name), she also says that 'he's cute when he's angry'. In Sonic Chronicles, Rouge admits to Sonic that Knuckles is cute, but she doesn't know if he was the right type for her, and also when Amy said 'Wait..so Shade is 4000 years old?' and Rouge tells Knuckles that 'Your always in to older women, eh Knuckles?'.Rouge flirted a lot with Knuckles, since he is emotionally unstable to her.Her eye for Sonic:In some games Rouge shows interest to Sonic. In Sonic Battle she had some flirtation with Sonic on the beach to get Emerl. In Sonic Chronicles she flirted a lot with Sonic, Amy was very jealous to it. Sonic helped Rouge in her mission. Rouge usually calls Sonic 'handsome' or 'big blue'.At the same time Sonic never ignores Rouge.