Fumika Mikawa is a character from the Shigofumi series.
This article refers to the human version of Fumika Mikawa, who will always be referenced using her full name or "the human version". The mail carrier version, who will always be referenced as Fumika, can be found at the previous link.
Fumika Mikawa was subjected to abuse from her father, Kirameki Mikawa, from a young age and developed a split personality disorder. The other personality, known as Mika, eventually shot her father, although he was not fatally wounded. When Fumika Mikawa discovered this, she fell into a coma and Mika gained a physical body, becoming the mail carrier known as Fumika.