This one is a battle between Kasen, Byakuren, Hina, Shikieiki or Keine. Yukari can't keep up with them.
Kaguya beats her there.
Koishi, Youmu, Futo, Flan, Kogasa, Kyouko, Cirno and Yuuka (Youkai Moe)
As lovely as the other 2hus. Nothing outstanding. But if we're talking maturity then she has quite the Competition (Shikieiki, Eirin, Keine, Kasen, Okina, Byakuren, Miko, Yuyuko, Kanako etc.) for that Title.
The bunnies and the other animal-like youkai are a thing, plus Kasen is "The Wild and Horned Hermit" and Oni's like Suika have literal Horns.
Thats Kosuzu. Yukarin is 17 while Kosuzu is 12 or so.
Heh, yeah right.
Looks like Yukarin is nothing special after all.