|Season||Pretty Cure 5☆Reborn|
|Japanese Voice Actress||Atsuko Yuya|
|Siblings||Kasugano Yukito (brother-in-law; husband)|
|Relatives||Kasugano Kaori (daughter)|
Kasugano Stella (daughter)
Kasugano Ken (son)
Iona appears with black hair that hangs just above her shoulders, and black eyes with glasses. She wears a grey shirt with a green and dark green jacket, an orange wristband and jeans. She also wears black sneakers.
Iona is shown to be fun-loving and confident, the opposite of her daughter Kaori. She is not afraid to stand up for who she is, but she loves her family very much. She has been shown to give out good advice.
Kasugano Kaori - Kaori is her daughter. When Kaori was struggling to find a good story, Iona gave her some good advice.
Kasugano (春日野): Kasu (春) translates to "spring" and ga (日) translates to "sun" or "day". Together, as "spring day". No (野) translates to "plain" or "field", and is a common component in Japanese surnames.
Iona (いおな):The name originates from old Irish and means "blessed".The kanji writing used in current Chinese Wikipedia is 伊於奈, according to 江崎玲於奈 (Leona Esaki), a Japanese physicist. Iona can also mean "violet" in the old English language.
Iona's name means "blessed of a spring day".