Blue End "Devil" Heart is Lucy's older sister. She is Mistivious, Mysterious, and like a kid at times.She is nice, but can be mean at times. She has a crush on General Sub Z. Extabyte of the Sky Army.
She's 6'8 and is 19. She's tan and has long black hair, and dark brown eyes that contacts make ocean blue. She wears a camo best, black long-sleeve shirt, dark blue jeans, a camo cap, and black sneakers.
Blue is a Ender hybrid that is a recruit of the Sky Army.
Her Alto-ego's name is EnderDevil.