Sakura Kasugano was the only really new character in Street Fighter Alpha 2 if i remember it right. There were also Dhalsim, Gen and Rolento added to the roster, but those were characters seen in previous Street Fighter and Final Fight games before.

She is quite a cute japanese schoolgirl and its no wonder Tovio Rogers, the artist behind this fan art says she is his favourite Street Fighter character.

I really loved her stage and music in Street Fighter Alpha 2 too

Sakura Kasugano Street Fighter Girl