Karen Aldrin is a supporting character from the anime Brave Bang Bravern. She is a 25-year-old female officer with blue eyes and blonde or yellow hair that is cut to neck length. Her birthday is July 22, making her a Cancer, and she has O blood type. She stands 168 centimeters tall, a measurement which includes her heels. Karen is a member of the United States Air Force holding the rank of First Lieutenant, known in Japanese as chūi.

In terms of personality, Karen is characterized as a mature woman who carries herself with composure and confidence, often appearing to have an air of leisure or self-assurance about her duties. This steady presence makes her a respected figure, and she is admired by her fellow controller Honoka Suzunagi. Outside of her military responsibilities, she has a fondness for exploring local gourmet food spots and drinking whiskey, while her dislikes include reptiles.

Karen serves in the role of an intercept controller for Titanostride, or TS, units. Her primary assignment is to manage the control operations for pilot Lewis Smith, but her responsibilities are not limited to this single task. Depending on the tactical situation, she is also qualified to conduct ground attack control for aerial units, demonstrating her versatility and skill as a controller. Her ability lies in her tactical acumen and efficiency in managing combat assets from a command position, ensuring that pilots like Smith receive the necessary guidance and support during missions. She has also earned the nickname Sledgehammer, which alludes to her capabilities or reputation within her unit. Information regarding her specific character development arc across the story or detailed analysis of her key relationships beyond her professional respect for and from Honoka is not available for this description.