Suzume Sakurajosui

Hibari's classmate who is her best friend. She is intelligent, mature, and even comes from a wealthy family. Her Pata-Pi is Francesca (フランチェスカ Furanchesuka), one which is an equally intelligent multitasker whom Suzume improves to be "the best"; it transforms into the Diva Hestia. She has three elder sisters Suzumi, Suzuna and Suzuri. Suzume's name literally means sparrow.

-bio taken from Wikipedia