Amidst the generous raspberry fields illuminated by the Hollyberry Kingdom's hot sun, proudly stands the grand Chateau Raspberry. In this place of history and culture, Raspberry Cookie was born and raised. Just like her great ancestors, she began fencing even before she learned the intricacies of aristocratic etiquette and rhetoric. Raspberry Cookie has been molded to become the heir and defender of the noble House Raspberry, sworn to protect its legacy. With her sword in hand, elegantly glazed hair fluttering in the summer breeze, and the proud House Raspberry banners behind her back, Raspberry Cookie is about to claim another victory from the clasp of fate.

Raspberry Cookie is an honorable and fair (albeit pompous) fencer of House Raspberry. As the heiress of the House, she takes dueling and her family's dignity seriously; this is shown when, after hearing Princess Cookie's negative opinion on seeing Cookies fighting each other, she challenges the former to a duel. However, she quickly buries the hatchet and helps GingerBrave and friends in stopping Pitaya Dragon Cookie from annihilating the Hollyberry Kingdom.

Appears as an entrant in the Hollyberry Kingdom's princess contest. She arrives while accompanied by her cousin, Raspberry Mousse Cookie, who reminds her of the great faith their family has placed in her and that she mustn't fail. Undeterred by the pressure, Raspberry Cookie remains confident and swears to restore their house's former glory by becoming the Hollyberry Princess.

Overhearing this, Head Icon Princess Cookie, another entrant in the contest, indignantly claims that she is the only true princess due to being the Queen's daughter. Raspberry Cookie takes notice and recognizes her as the Cookie that ran away from the Hollyberry Palace long ago, mocking her as a competitor by calling her tough yet unimpressive and shutting down her claims with a reminder that Queen Jungleberry Cookie herself is the one who arranged the contest. She warns Princess Cookie to prepare herself as House Raspberry is the most powerful, affluent, and persevering family in the Kingdom.

During the first trial of the qualification rounds, an eating contest, Bat-Cat is able to tamper with a pitcher of fruit punch by mixing it with Head Icon Poison Mushroom Cookie's spores. The contaminated punch causes those who drink it to become much more hostile and temperamental, leading to many fights and arguments between participants until the effects wear off. Princess Cookie complains that the all the fighting is exhausting and not enjoyable, which Raspberry Cookie takes as a personal insult to her house. She proclaims that their culture and wealth has been built with nothing but the tips of their swords, crediting their fighting as what placed them above other houses of nobility and accusing Princess Cookie of insulting the great deeds of her ancestors before challenging her to a duel. Knight Cookie attempts to protect his liege by taking the fight instead, only for Princess Cookie to order that he step aside.

After losing to Princess Cookie, she vows to never forget the lesson taught to her by her defeat. Princess Cookie offers her hand to help her up, though Raspberry Cookie harshly rejects her help and shouts that she get away from her. She warns that, while Princess Cookie may have won this once, she is still a proud descendant of House Raspberry and has no plans to give up on the contest nor her duty as the house's heiress. Their conversation is interrupted by Host Cookie informing that the other contestants are already on their way to the upcoming trial at the Hollyberry Palace.

Raspberry Cookie is able to successfully pass the rest of the trials, including bypassing the Royal Gardener, surviving a Barrel Run, and lasting until the end of a dance party despite it being infiltrated by Shadow Assassins and other meddlers.

Upon reaching the final round, the remaining 10 contestants are confronted by the Pitaya Dragon. Raspberry Cookie initially mistakes this as intentional, remarking that the dragon must want to personally oversee the trial and declaring that she will use the opportunity to show the might of House Raspberry before the dragon attacks. Greatly offended that the dragon would have the audacity to attack the heart of their kingdom, Raspberry Cookie threatens that the beast will have a taste of her blade.

Realizing both that the Princess Contest is no longer the priority and that she cannot defeat the dragon on her own, Raspberry Cookie instead chooses to evacuate the other Cookies in the building alongside Blueberry Cookie, Bumbleberry Cookie, and Cranberry Cookie. She leaves the fighting to Princess Cookie and entrusts that she "show that lizard the spirit of the Hollyberry Kingdom" before leaving. While guiding the Cookies out of the palace via different escape routes, Raspberry Cookie runs into and thanks Bumbleberry Cookie for having offered to help. Bumbleberry Cookie brushes this off as something any esteemed Cookie would do before their conversation is interrupted by an ambush. Raspberry Cookie recognizes the Cookies as the same meddlers from the contest, who laugh at the idea of an evacuation and claim that no one will be going anywhere.

While fighting the Shadow Assassin, Raspberry Cookie internally questions why there is only one of them and determines that something isn't right. Worrying for the safety of the civilians, Bumbleberry Cookie attempts to guide them towards the exit once again, making Raspberry Cookie realize that the intruders must have laid some kind of trap at the exit. She manages to warn Bumbleberry Cookie of the trap before anyone is affected and causes the assassin to abort the ambush and switch to plan two: destroying the exit. Raspberry Cookie remains steadfast and swears to stop them all with the blade of House Raspberry.

After the intruders are defeated and everyone is evacuated safely, Raspberry Cookie continues to entrust the fighting to Princess Cookie and orders all other descendants of the noble berry houses to defend their kingdom.

Raspberry Cookie is chosen for a scouting mission to Beast-Yeast by Jungleberry Cookie. Once there, she and a few soldiers fighting the monsters there, barely managing to hold them back until Hollyberry Cookie arrived. Pavlova Cookie telling them the monster they killed had a lover before taking them to a place for the wounder and exhausted to recover.

Raspberry Cookie is the heiress of House Raspberry and is Raspberry Mousse Cookie's cousin.

This relation is confirmed by a loading screen tip that states "She doesn't say this out loud, but Raspberry Cookie is proud of her cousin."