Sketch is a 16-year-old AU version of Poppy, who lives alone with her mother, "Toriel Asunder," in a desolate and abandoned timeline.  In her "canon", they go on expeditions together, exploring the Other Side and searching for secrets to undo the Omega Timeline...but today, she's going kart racing with the rest of the gang.

She has a vague European (German or UK) bent to her voice.  It's alright if she sounds a bit older than she actually is—she has forced herself to grow up a bit too quickly.  Above all, she needs to sound like she is staking *way* too much of her self-worth on the outcome of this kart race.