During the events of Deltarune, Kris is mentioned to be an introvert.[4] Susie and King refer to Kris as a "quiet person," and Noelle is astonished if they converse about "anything."[5] After Kris's brother, Asriel, left for college, they became distant from their few friends.[6] Kris's side of their shared bedroom is also strikingly bare. The shared game console is underneath Asriel's bed, and their old children's books are in Toriel 's classroom instead. Toriel has also mentioned that Kris is not normally energetic.[7] They have a history of not waking up on time, and often slept through the start of class.[8] Kris also preferred their mother driving them to and from school than walking.[9] Contrary to Kris's apparent detachment, they do have a variety of interests. As a child, Kris shared Asgore's love of Cowboy's as recounted by Tenna and one of Toriel's wallpaper's revealing a photograph of them wearing a cowboy hat while bouncing along with Asgore.[10][11]Kris has always been mischievous, pulling relatively harmless and or dark pranks such as covering themself in ketchup and claiming it was blood, or replacing eggnog with mayonnaise.[12] On one occasion Kris placed a bath bomb in the toilet earning, Toriel ire all the way to the present. In the event, Kris continues flushing the toilet before or after going to school, Toriel replies: "You did not put a bath bomb in the toilet again, did you?"
