Mei

Rosa is the female player character in Pokémon Black 2 and White 2. Her male counterpart is Nate. Rosa is a young girl living in Aspertia City with her childhood friend Hugh. At the start of the game, she sets off with Hugh to collect her first Pokémon. They then go their separate ways, and she starts her journey across the Unova region. (Source: Bulbapedia)