Tigerlily (named Zuruko in the original Japanese version) is Yuna's mean, bullying cousin who appears mid-way through Season 2 of Stitch!.
Although she is harsh to Yuna, she's only trying to be a role-model. Which is why she blackmails Yuna into doing the chores around the house, because of her bad grades. Yuna and Stitch reluctantly move off to live with her in Season 3 and she starts to mellow out a bit. Though she treats Yuna the way she is, Tigerlily (like Nani for Lilo) she loves and cares about Yuna, nevertheless, and would do anything to keep her off danger, even of that meant to sacrifice on her own.