Rika often seems wise beyond her years. As a very young child during Himatsubushi-hen (which is set in June of 1978), she predicted her own death in June of 1983 to the visiting Akasaka Mamoru. Childish Rika has a tendency to speak using "cute" phrases; including sound effects and nonsense words such as "nipaa,"mii," cat sounds and saying "pachi pachi" (clap clap) while clapping her hands, all of which drives the cute-loving Ryūgū Rena wild.

When revealing her True Personality, Rika's cuteness disappears, and she turns cynical and more mature. She switches pronouns from "boku" to "watashi" and her voice drops to a grown woman's.

For Rika's child voice - I need a high pitched voice.

For Rika's Adult Voice - I need a low, adult pitched voice