Felt recurs throughout the crossover series as a member of Class 1 alongside her knight Reinhard van Astrea, Julius Juukulius, and others. Her background from her original world involves growing up as a thief in the slums before being identified as a potential royal candidate, primarily informing her personality rather than shaping the crossover narrative. Her established traits—independence, straightforwardness, and occasional abrasiveness—persist, particularly toward authority figures and individuals she dislikes, such as Subaru Natsuki. This stems from prior interactions where Subaru belittled her home, prompting her physical retaliation. During school events like the royal selection reenactment, she kicks Subaru and generally avoids him afterward. In collaborative activities like the field day cavalry battle, Felt demonstrates pragmatism. Facing Subaru's team and later the teachers alongside her teammates Reinhard, Julius, and Chris, she proposes a temporary alliance: "Don’t get the wrong idea. First, we’ll team up to beat the teachers. Then, we’ll be free to duke it out between ourselves." During a crisis involving a giant machine, she barks decisive orders at Subaru’s team. Her relationship with Reinhard reflects resistance to his loyalty and protective overtures, a continuation of their original dynamic where he serves as her knight. She consistently rebuffs his attempts at camaraderie, such as rejecting chocolate from him during Valentine’s Day. Beyond these interactions and her participation in group school activities like field day competitions, her role remains supportive, emphasizing established traits through comedic or situational dialogue during ensemble events.