Sounds somewhat like conjoined twins, lol who, BTW, often can't live w/o each other, unless there's (successful) surgical intervention.
Hey there. In a way, that's probably it. Here's what Takeuchi has said:
1. They're identical twins and Ptilol (younger) just hides away somewhere whenever Cyprine's not fighting......not like Ptilol mattered when Cyprine beat the inners/outers by herself and Super SM crushed them both with one corny attack
2. Ptilol derives form from Cyprine and is literally the same being as Cyprine
Obviously, this is manga stuff, but #2 can exist with #1. And #1 makes no sense for the anime when Eudial taught them all everything about witching including, presumably, how to fly. Tomoe, meanwhile, taught them about the heart-snatching.
In the manga, Cyprine's a lab creation which would make Ptilol a twin creation of Cyprine from Tomoe, with equal standing, confirmed by Kaori. But in the show, they're human, so they already existed and we don't see Ptilol until the end, long after Eudial puts them to work and Tomoe educates them. We see Cyprine somehow setting up booby traps like Eudial, somehow knowing the dimensional trick that Mimete's one daimon knew, knowing how to use the stars to store pure hearts (which only Eudial/Tellu did besides that)...and her disappearing even longer than Tellu and Viluy for whatever reason. We know what Tellu and Viluy worked on in their spare time, both using Eudial's PC--and we know Ptilol shared Cyprine's body...after Cyprine was taught by Eudial. Meaning, at some point, Cyprine did some kind of unnatural wizardry to create an intra version of herself, expecting to fight Serena's team. Or more precisely, she used magic to split herself in two and renamed her other half. Naturally, she fashioned another star-staff for Ptilol too.
Since she heeded Eudial so much and
still wanted Eudial to retire, she reminds me of that smartass kid who picked up everything real fast and then thought they were too good to bother with anyone else in class, even the teacher. Official anime sources do say she's the strongest witch of the 5...but even with Ptilol, I still think the Flame Buster 2 would've lit her ass up. But that's probably a stan's dream. She not only made (and blew up w/ 1 attack) her own illusory dimension, she toyed with the inners while absorbing their powers, while still draining Mugen's students, while creating and hiding off a spacetime portal that led her directly to Tomoe/Mistress 9. When she died, the illusion crumbled and the warp in spacetime reappeared for the inners to reach Chibiusa. Also, she absorbed the tiara attack which I guess means the tiara regenerates in the show.
[All that's to say, unless she was screwing around, she was either working on Ptilol during her downtime or preparing the setup for her heart-snatching plan.]
But this thread was about shippings, so while we're on the subject:
Eudial--None. Which I prefer. Actually, she seemed pretty cold and professional to Tomoe and even hung up on him when he was BS'ing. Maybe something with a younger version of the witches, where she first recruits them.
Mimete--None. I mean, this dummy slapped away Eudial's computer when she got mad. And not only did she slap Minako's hand away and attack her for trying to be consoling (as if Mina didn't also fail the contest), but she then completely ignored Mina to kill the celebrity guy when Mina was choking right in front of her. You'd rather ship Naru and Luna. At least they didn't kill each other when they hung out. This psycho was knocking out random bystanders for fun anyway, so [BLEEP] her. She wishes she were
actually famous like her manga self. How're you gonna get outdone by a 2-week-old monster seed?
Tellu--None...maybe Eudial, if anyone. She didn't seem too interested in Tomoe at first, mainly just crafting her hundreds of plants with Eudial's PC. She killed Mimete for being a general idiot, and probably for killing Eudial too. Someone left Eudial a "Tellun" on her desk. And she kept calling them the "Witches 5" even after putting "Witches 3" over Mimete's "Witches 4". And she left the fight right after killing Mimete. And before killing Mimete, she lectured her on taking Eudial's invention (not to mention that recording device to spy on her/Tomoe), let alone not grasping it. She also didn't insult Eudial unlike the others. For the record, Tellu, for how smart she was, was kinda stupid for sending her "it'll eat your pure heart and then explode" plant after people who could've been--and were--talisman-holders.
Viluy--None. Likewise didn't seem to be interested in Tomoe, only the mission, and straight-up told Kaori to knock the flirting off (and shoved her). She maybe could've had a friendship with Ami if Ami'd been more openminded, but that's mainly in the dub.
Cyprine/Ptilol--Unlike the others, it appears Cyprine/Ptilol actually wants Tomoe's personal approval. By the time she steps up, she's already #2 because everyone else is gone. If nothing else, she was buttering up Tomoe with made-up rankings and dissing Kaori before Kaori was even there. Then she smirked at Kaori's stalker self when she noticed Kaori on the ceiling. I do like that she didn't put hands on Kaori or anyone else on her team......and still, the extra cattiness with Tomoe, plus the way she speaks (calling Eudial "oban"?) makes it pretty obvious she's the youngest one. Eudial herself sounds like the oldest, let alone anything else.
--Forgot to mention you do see Cyprine with red hair at one point. Tomoe/Kaori don't seem to care. Anime screw-up or subtle foreshadowing?
"Curse you, Cyprine.... You'll see, Cyprine...."
Gotta love how Kaori talks about Viluy and Cyprine like she actually knows them.

She never spoke to Cyprine at all and only "spoke" to Viluy because Viluy got on her about latching on to Tomoe. Honestly, pairing Kaori with anyone else seems odd.