RaspRose

RoseMousse is the het ship between Raspberry Mousse Cookie and Rose Cookie from the Cookie Run fandom.

Canon
As seen in the game, the two normally don't interact as much. This would mean that the two don't have lots of dialogue talking together, which would mean it'd be impossible to distinguish any type of canonical stuff about the two. The only time they'd interact is when you'd check their relationship chart. This would mean that anytime they'd interact is when they'd either state some positives or negatives about each other. In this case, we'd get to know about their relationship (shown below).

Cookie Run OvenBreak
Raspberry Mousse seems to watch her dance on stage every single day, according to Rose's relationship chart. It is heavily implied that he holds feelings for her, as his heart raced around her, but he tries brushing it off and asks himself what sort of cursed magic is that. On the other hand, Rose doesn't seem to hold any special feelings around him, and doesn't seem to spark much interest in him either. The only other time they'd interact is during the offscreen dance. Other than the relationship chart, they don't seem to interact as much as other characters do.

Similarities
One similarity about the two are that they both Epic Cookies, meaning they are hard to obtain in the game. Another similarity is that they haven't appeared as playable characters in the sequel of the game, Cookie Run Kingdom. The two have also interacted with White Choco Cookie, as seen on the relationship chart. On top of that, the two are shown wearing a shade of red on their outfit. The final similarity is that they both have an alt costume that have a shade of pink in it.

Fanon
RoseMousse is portrayed as a Valentine's ship, as the two are usually scene in fanart doing lots of dances. The ship probably began when the relationship chart was shown about how the two felt to each other. Another way this ship started gaining attraction is when Rose Cookie would be unlocked after Raspberry Mousse Cookie was unlocked, instead of just being unlocked by herself.

It also may have started when their Combi was released as an exclusive Combi for the gamemode Friendly Run, where two players can play as two different cookies at the same time. A Combi would be when two specific characters are paired together, there would be an exclusive skill in which it would help the two cookies. Since they are an exclusive Combi, this would show when the fandom may have started shipping the two.

When compared to other ships in the community, RoseMousse is one of those ships that is shipped a lot by the community, as it has lots of fanart about the two. Some may even consider it canon due to how much the ship is implied in the game. However, it loses to ships (such as MintCocoa) that have more interactions in the game. This may be due to the fact that the only times they interact are during the relationship chart & Friendly Run.

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Trivia

 * Both of them were released in the Valorous Champion's League update.
 * In the Wish Festival, Raspberry Mousse's wish was "I wish... she would dance for me.", and the person he is talking about is heavily implied to be Rose Cookie.
 * Raspberry Mousse & Rose Cookie is an exclusive Combi for the Valentine's Day version of Friendly Run.