Kris is quiet and introverted. Their reticence causes others, such as Susie, to be more observant of Kris's body language to gauge their reactions. Despite their quiet disposition, Kris has a proficiency in flirting, though they do not normally use it for romantic purposes. Kris tends to speak in a "deadpan, mumbly voice", which causes others to occasionally repeat what they say. However, during the events of Deltarune, Noelle notes that Kris's voice sounds unusual, as if it was "on speaker". On the Weird Route, she notes that it is unrecognizably different from Kris's voice. Kris is not normally energetic. They have a history of not waking up on time, and often sleep through the start of class. Kris also prefers someone else getting them to and from school. Over time, they grew increasingly distant from their few friends. Kris's side of their and Asriel's shared bedroom is also strikingly bare; the pair's game console rests underneath Asriel's bed, Kris's old children's books are stored in Toriel's classroom, and there is nothing on their shelves. It is implied that Kris enjoys reminiscing on their childhood, and that they are unsettled by the thought of growing up.
