Linu La'neral is a female elven cleric of the elven goddess, Sehanine Moonbow. She hails from the city of Evereska. Linu is clumsy (some say unfortunate), often causing accidents in her wake. She has a somewhat naive world view but is well liked by many players for her constantly positive outlook and her kindheartedness to the player character and others. She has a great deal of humorous lines and stories, including how she met her now dead husband.
Due to her outgoing and affectionate nature, many of her lines can be interpreted as romantic towards male PC's. Some flirting is possible, and as long as a male PC completes all three of her quests and is kind to her, a romance is possible. However, the romance has much less dialogue than other NPC options (notably Aarin Gend and Aribeth), and is more of an implied future romance. As such it is unlikely she was intended to be a full romance option. Linu reappears in the first chapter of Hordes of the Underdark.
Source: Wikipedia, "List of Neverwinter Nights characters", available under the CC-BY-SA License.