Fuyuno Yoshizumi

Fuyuno Yoshizumi (吉住 冬乃Yoshizumi Fuyuno) is a heroine of Imouto de Ikou!

Background
While searching for her beloved older brother, Fuyuno somehow ended up in Mayuka's UFO and was placed in suspended animation until she awoke decades later in her grandnephew's time.

Personality
She appears to be a very formal and old-fashioned girl, addressing Hisashi as "onii-sama", a very formal term for "older brother".

Etymology

 * Her given name Fuyuno (冬乃) consists of "winter" (冬) and "of" (乃).
 * Given the pattern of 0verflow characters being surnamed after Japanese politicians, Hisashi might be surnamed after Kenichi Yoshizumi, who is the current mayor of Shinjuku.

Trivia

 * Her seiyuu, Ami Shizuki, also voiced Satsuki Shigehara of Large PonPon and Midori Nagawa of PureMail