Barbara (バーバラ bābara) is the mascot of the Japan-only release Daigasso! Band Brothers (Jam with the Band was its slated North American name) for the Nintendo DS. The manager of the music store, GB Music, in Waruwaru Town, she is an avid guitar player. She guides the player throughout the game and possesses a rather arrogant personality. She also appears in the Nintendo DS game Master of Illusion. When Barbara appears, she plays her guitar for a few seconds, sending out musical shockwaves that damage the summoner's opponents and cause reasonable knockback. This works in a similar fashion to Donkey Kong's Konga Beat.
The manager of the music store GB Music in Waruwaru Town--her real name is Barbara the Bat. She leads the player through the game, showing her arrogant attitude as she cracks the whip at others but pampers herself. Her little brother's name is Tingtin the Bat. By the way, the "GB" in the name of her store stands for "Great Barbara," NOT "Game Boy."
As the manager of a slightly dubious talent agency, Barbara's always looking for people who want to join a band. She'll even teach you to play--whether you ask her or not. It's best to let her think she's taking advantage of you, even if she really isn't. Her hidden theme music really illustrates the contrast of darkness and light in her soul...or something.