Karley is Mallory's younger sister who appears on the vlog whenever Stephen takes a trip to Wisconsin. She has taken over the vlog as "KarleyVlog" twice. She currently lives in Minnesota with her cat named Cat. She is well known on the vlog for her random style of humor and outgoing personality, such as when she rubbed Stephen's toe, mistaking it for Mallory's. She is another one of the more common fan favorites of the vlog.