H!P members that are all about Rika are the H!P Kids.
They all idolize her. Momoko did "HAPPY~~" on an Utaban, Nakky cited her as her favorite on the All For One special, and if you watch the Kids during Rika's "Watashi Rika-chan...." bit, they find her HILARIOUS.
Yeah. The Kids adore Rika. Or at least did when they first joined.