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Here is a list to her success more or less
1. She debuted as a Nijisanji milestone celebration, not only gaining full focus from a whole big vtuber corpo but also vtubing in general
2. Solo debut, debuting alone put her in the eye of the hurricane gaining all the attention to herself
3. Character trope. The OH HOHOHO Ojou-sama trope was surprisingly underused in big vtubing despite being extreme popular in anime, and she portrays the character flawlessly
4. "Desu wa" is arguably a popular easily recognizable meme, much like Gura's "a" or "Peko's Peko", and she fully capitalizes it, becoming synonymous with it.
5. She delivers near uninterrupted in-character commentary, full of energy and with adult humor which makes her streams never feel boring. She is also unfazed by gross or scary stuff and showed her esophagus on her debut. making her a very unconventional character.
6. She always streams 1 hour daily at the same hour, this makes her content simultaneously scarce and yet abundant, and she will always be there when people comeback at the time
7. Midnight time, she streams right before Japan normies go to sleep, during the time "it's-too-late-to-do-anything" but "I don't want to sleep yet", which is probably the biggest reason why her audience is so recurring and hardly ever funnels. She basically replicated the very-late-night time slot that made NCIS one of the most watched show ever, basically the show everyone watched to wait for the sleep to kick in.
