Istra is a tough cookie. When her mom was nursing two orphaned kittens who were a fair bit larger than Istra and one of them wanted to push her out of the way to nurse, Istra didn't back down. She'd keep nursing while she scraped with the bigger kitten to the side.
She is also a softie. She played gently with her special needs brother and then snuggled down with him for a nap.