What stage persona did Beyoncé use in the 2008 album title I Am... ?

Beyoncé used the stage persona Sasha Fierce in the 2008 album title I Am... Sasha Fierce.

The double album contrasted two sides of her public image. The “I Am...” disc emphasized more personal and emotional songs, while the “Sasha Fierce” disc leaned toward performance-driven, dance-oriented material.

Beyoncé later explained that Sasha Fierce represented a bolder alter ego that appeared when she performed. The persona became especially associated with high-energy songs such as “Single Ladies (Put a Ring on It)” and “Diva.”

A common misunderstanding is treating Sasha Fierce as Beyoncé's legal name or a separate performer. It was a creative stage concept used during a particular period of her career. Beyoncé later said she no longer needed the alter ego because she had become comfortable merging her private and performing identities.