Erika Otohime is a character from the manga and anime Rokudo's Bad Girls, known for her striking appearance and her past as the leader of a powerful all-girl gang. She has long purple hair that reaches her waist, often styled with intakes and a ponytail, and piercing blue eyes. Her distinctive look is sometimes completed with a lab coat, hinting at a more practical or analytical side beneath her tough exterior.

Erika is the former head of Team Ryuugu, a street gang that she led to the top of the city's underworld. During this time, she became a mentor figure to Ranna Himawari, one of the series' main characters, and was the one who gave Ranna her signature wooden sword. However, when a larger and more dangerous syndicate known as the Onishima Alliance began targeting her crew, Erika made the difficult decision to disband Team Ryuugu in order to protect its members. Since then, she and her former gang have been trying to live as law-abiding citizens, though they continue to dress in their original gang style as a mark of their identity.

Despite leaving her life of delinquency behind, Erika remains a significant figure who is deeply concerned for the well-being of her former protégé, Ranna. When she notices a troubling change in Ranna's personality, she takes action not by intervening directly, but by tasking the protagonist, Tousuke Rokudou, with the responsibility of keeping Ranna happy. This demonstrates that Erika is a strategic and caring leader who prioritizes the safety and happiness of those close to her over power or status. Her role in the story is that of a former rival and ally who helps set important events in motion, using her past experience and influence to guide the younger characters from behind the scenes.