Joan Justice is a young adult townie in The Sims 3 for Nintendo 3DS. She has the Mean Spirited, Virtuoso, and Unflirty traits. She has red hair which is covered by a pink wig and blue eyes, and dresses like an anime character. She can be made playable by marrying her or asking her to move in.
Not much is known about her early life because she does not appear in any other Sims games. It is possible that she is Kim Justice's sister, since they share the same surname and have a high relationship at the start of the game.