No, Rika's depiction is a displease to her fans, killing her popularity, shaming her character even disregarding that she's a passion type idol, and making her into Akagi #2, without even giving her some decent lines much unlike Kirari and needless to say, the perfect glorified sister Mika.
And it's not like midriffs can't be shown in anime according to current politics. It's not THAT bad. I didn't ask for making outright porn of her.
When you say that the depiction is "a displease to her fans, killing her popularity, shaming her character even disregarding that she's a passion type idol, and making her into Akagi #2, without even giving her some decent lines much unlike Kirari and needless to say, the perfect glorified sister Mika," you are already establishing yourself as someone who thinks that they speak for the whole Rika fandom, without any regard to what other Rika fans actually think.
In other words, how can you be so sure that her depiction in the anime has, in all certainty and absoluteness, demoted her status, decreased her popularity, displeased her fans and overall degraded her as a character? Do you have any backing on this, or this is simply your opinion?
And in the case of midriffs, I can assuredly say that, in accordance to what I see in the CG anime, her clothes are sexy, as compared the other loli idols. In fact, I don't really understand why your complaining about Rika being 'toned-down' in the anime, when she's comparably naughtier or more suggestive than the other girls her age, as indicated by her mannerisms and lines.