Duke Meerkat (father)
Tatiana is the daughter of the Duke Meerkat, and her father leaves Timon and Fred to guard her castle. Because Timon is in love with Tatiana, he daydreams about her, but when the Duke leaves the castle, Fred persuades Timon to go on a date with her, and impress her with candy and flowers (and a bath) to which Timon agrees to do. Abandoning his guard post, a giant cobra infiltrates the colony and kidnaps Tatiana just before Timon goes on a date with her. The Duke and his jury find Timon guilty for leaving his post and banish him.
After meeting Pumbaa for the first time, Timon hears Tatiana's cry for help when she's about to get eaten by the cobra, and the duo rescues her and brings her back to the colony. At the trial, all charges against Timon are dropped for the brave, cunning, and resourceful rescue of Tatiana. As an added bonus, the Duke offers Timon the key to the city, and Tatiana offers her hand to him in marriage. However, Timon chooses to be best friends with Pumbaa, and so the Duke exiles Timon and Pumbaa from the colony.
In the episode Timon in Love, there is a female meerkat that bears a striking resemblance to Tatiana. The only difference is Tatiana is a blonde, while the female meerkat in the episode is a redhead, has brown eyes, darker fur, and no tiara.
Tatiana is a pale brown meerkat with dark brown stripes, a creamy white chest, and dark blue-green eyes. In addition to that, she has blonde hair with a blue ribbon and wears a tiara.
The Lion King Wiki has a collection of images and media related to Tatiana.