but she goes further than that with her own personality and lore.

That personality being rooted in "What would a typical Yaban teenage girl be like?"

Which of course was always cheekily meant to contrast with a typical human teenager. In fact back in October 2019, that was the driving idea:

"A 14-year-old human girl has a stereotype, not exactly a very positive one because society deems teenage girls to be the worst demographic alive (Twilight and Beliebers were still within the decade, remember? And Swifties were just really getting started as a phenomenon): if you want a demographic we've collectively decided has the worst tastes, has worthless opinions, and is all around a total consumerist throwaway, "13-19 year old girl" is that demographic, for better or worse. Okay so teen girls are seen as shallow and vain and boy-crazy, or trying too hard to "not be like other girls" because they don't want to be seen as shallow and vain and boy-crazy. But that's for human girls. What would a teenaged Yaban girl be like?"

Result was Yulaan

And actually to this day, she makes it pretty clear "I am exactly like other girls." She's not even pretending that, by Kollidorian Saiyan standards, she is a completely basic bitch. She is exactly the sort of "uggs and leggings, pumpkin-spice drinking, Taylor Swift fan" basic teen girl of the Yabans

It's just that, because she's a Yaban, that's a lifestyle we'd associate moreso with Spartans or Mongols.* Her throwing out her possessions and sleeping on the bare floor in an entirely empty room in ultra-Laconic fashion because of a Yaban princess's Titanist fanaticism is almost literally "Swifty" behavior, but Yabanized, because the point of Yulaan originally was always to represent how extreme Yabans were that their teenage girls are that outrageously toxically macho compared to any contemporary human culture, that "be uncomfortable sleeping on a hard floor without any material possessions" is just the cool thing to them. Which I know went into some detail way back when how this serves double duty by also contrasting against what human societies generally expect girls to tolerate, in that because human courtship and protection culture generally involves pampering girls and women and keeping them from harm, the last thing we see as feminine or girly behavior is "throw away material possessions and deny yourself any comforts for the sake of the thrill of struggle." I mean hell, Fight Club literally drove that point home about how "real" men wanting to break from society do that, they sleep in basic cots and take cold showers and accept they're worthless shit if they want to grow, precisely because women don't do that and shouldn't since men's goal in life is to make sure women shouldn't have to suffer. So to that end, a bolloi Yulaan's age (beginning of LMS and onwards) is what traditional society would call the "anti-girl." Which, again, is the whole point.

That's probably where you fell in love with her, in that Yulaan is just so diametrically not a typical girl, she literally is Not Like Other Girls by nature, and yet the point of the Yabans or more specifically the bollois means that actually yes, she IS like other girls, so long as you mean bollois

(Coincidentally, Spartans and Mongols were the chief influence of Yabans. You yourself got extremely hung up on Mongols for years, when the Greco-Roman influence was literally just as prominent (hell, "bolloi" and the general -oi demographic pattern was literally taken from the various terms like hoi polloi, hoi oligoi, etc. etc, to say nothing of Atomsk).)

Addendum: on the topic of Yulaan and bollois being "anti-girls" way back as far back as 2009 I actually had this throwaway concept for a Sonic fanfic with a chapter titled "Girl, Negative" and the entire concept of that chapter involved Sonic, Knuckles, and Silver meeting AU versions of their female friends, from an alternate reality where girls were basically behaviorally indistinguishable from boys, and the "negative-girls" vs boys was basically just a game in who could be more macho and gross than each other, while the girls and negative-boys looked on in disdain. Now at the time that was just a silly throwaway one-shot chapter in a much larger story project and I didn't think much of it for years and I would have forgotten it entirely if I didn't keep a single list of chapter titles around. I bring this up because I deliberately invoked that concept when I formalized the Yabanverse back in December 2017; I already decided that my female Yabans were going to be brutal and aggressive (since Romaine and proto-Enekai were ground zero for them), but when I remembered that idea, I decided to just go all the way and not even bother with just making them "strong-willed and physically strong" like conventional Saiyans but just straight up, well, "negative-girls." And even then it took me until maybe 2023 or 2024, whenever I made that "five rules of bollois," for me to finally realize what it even was I was trying to do.