My niece Ava. This kind of scrumptious cuteness is what her mommy was known for back in the day, too. I was poised to begin my first year of high school when she was born and made me into a girl with a sibling instead of an only child... I had a teeny little t-shirt made with "I LOVE MY SISSY" on it for her. I had wanted a little sister for as long as I could remember, and I was finally getting one, so I decided I wanted her to call me "Sissy."
She still does. It's the best.
As a funny aside, all the cousins that were born after my sister grew up calling me "Aunt Sissy." And Miss Ava will call me "Sissy," too.
I love that.