In junior high school, she was a head of Tea Ceremony Club. In addition, in order to talk along with the situation, she often surprised her partner even in a radio program.
She is a youngest child, her family is including her father, mother, and two older sisters.
In 2002, Iguchi auditioned for G.G.F., a collective name of mascot characters of Gamers, which is a retailer of anime and manga-related items in Japan. Iguchi passed and won a role as Sapphire, and also formed the voice actor unit G.G.F.
On 2013, Iguchi debuted as a singer with the song "Shining Star Love Letter", which was used to promote the Toaru Majutsu no Index - Endymion no Kiseki film.
She noted that her favorite anime character is Cho Hakkai from the Gensoumaden Saiyuki series.