Is Juri's problem really idealizing Shiori in some way? The prevailing interpretation I've seen is that Juri should accept she fell for a snake so she can remove Shiori from the pedestal of her love. Incidentally Ruka also shares this opinion. I disagree and I'm here to be a contrarian about it!
A nonzero number of takes base their "Juri idealizes Shiori" conclusion on the "innocently cruel" line, the interpretation being she's percieving Shiori's personality as sweet and innocent. But that's not what the line is getting at. Juri's emphasis here is not innocence as a synonym for purity, it's innocence as a synonym for ignorance and naivety. Both Utena and Shiori are "innocent" because they are unable to anticipate the queer dynamic, the deviant lesbian desire, that Juri is operating from, and "cruel" because, in their misunderstanding, they step on Juri's toes in unintentional ways.
Even though we, the audience, know in retrospect that Shiori meant to fuck Juri up, the exact way she did it was a freak accident, and at this point in the story she has no idea that she managed to hurt her. Shiori is operating from a different understanding, one that assumes Juri's absolute conformity to and supremacy in heteronormative gender roles. Shiori's whole mission is proving her value over Juri on that axis, obviously because as a suppressed homosexual she feels insecure about her continuing obsession with Juri. She assumes "beating Juri" at attracting men will balance the scales-- render Juri's image less appealing, and hers more. And of course that would hurt Juri, who must value her success with boys so much. That lack of awareness is what Juri is referring to, and she's right here actually, about both Shiori and Utena-- they are unable to conceptualize desire for other women as a potential outcome, and in part it's because of this that they end up harming themselves and others.
Moreover the "innocently cruel" line does not imply that Juri thinks Shiori is an innocent person because, if anything, Juri does nothing but doubt Shiori throughout the series.
At no point does Juri say anything positive about Shiori's personality or their friendship. She is unable to frame her ex-bestie's existence outside of the pain she's caused her. The narrative purposefully never tells us why she fell in love with her in the first place, or what their friendship was like. We don't know why she chose Shiori specifically, and that's part of the mystique of Juri's feelings and of their relationship, that the audience will never see who Shiori is outside of Juri's heartbreak. She could have a vibrant personality, but it's thoroughly obscured by the opacity of Juri's despair, and Ohtori 's miasma. Not to mention Shiori's own internalized homophobia, compulsory heterosexuality, and chosen constructed persona-- just like a lot of other bitches trapped in Ohtori. This is what the place does, it chews up queer teenagers and doesn't spit them out so much as it arranges them neatly into a series of possible stage roles.
Juri's current image of Shiori is of a witch. It's possible she used to think of her as a princess, sure, but then she inverted the role once Shiori acted out. If anybody's idolizing anybody, it's Shiori. She is the master of rendering other people into shining beacons!
I have more thoughts forming on how Juri's "casting" of Shiori plays out through her final duel (does Shiori's mistreatment by Ruka briefly return her to her role as a princess to Juri's gallant prince-- but this proves unsustainable or undesirable, because princehood makes her too vulnerable or liable to corruption?) but they're half-baked at this time.
I do think though that Juri's "miracle" might be "making [Shiori] understand [her] feelings" literally-- not necessarily having Shiori return them (though that idea looms over her including in her understanding of what a man could do in her place, thanks to Ruka for the reminder). The miracle may be finding some way for Shiori and others to understand who Juri actually is without making herself vulnerable or diminishing the ease with which she moves through the world. She doesn't want to get stabbed with those swords of hatred. So many people don't seem to understand her, yet Juri is terrified of embodying anything other than an impenetrable image of excellence...! Girl watch out!! You're just embodying the reason why Shiori resents you in the first place!!! Those swords are coming at you no matter what!!!
