Jane is a secret character that can be encountered in Undertale Yellow. She is an anthro deer monster that lives in the Snowdin region. If your save file's FUN value is between 30 and 34 (inclusive), leaving a certain room in Snowdin will, instead, take you to a room containing Jane. She appears to be a detective, going by her outfit and her stating that she is on the case of a missing monster, who is likely Wanda. Shortly after beginning her search, she became lost in the same woods as the monster she was searching for.