Karen Amishima is a character from the live-action television series Phone Braver 7. She is the younger sister of the protagonist, Keita Amishima, and is portrayed as a first-year middle school student. Within the Amishima household, she lives with her brother and mother, Harumi Amishima.

Karen is presented as a tech-savvy teenager, often spending her time at home engaged with her computer or mobile phone. She has a distinct and quirky personality, demonstrated by a peculiar hobby: on her blog, she performs cosplay as a middle-aged man. She is also well-versed in urban legends and possesses a naturally suspicious nature. This skepticism is directed towards her brother, as she becomes suspicious of his cell phone and his secretive activities as an agent for the organization Under Anchor.

Physically, the character has a slim figure and a distinctive hairstyle featuring shaved bangs. Her typical attire is a sweatsuit. Her primary role in the story is as a member of the protagonist's family, adding a layer of domestic life and potential conflict as her suspicions about Keita's secret life grow. There is no detailed information available regarding her specific motivations, character development throughout the series, or any notable abilities outside of her general computer literacy and investigative curiosity.