Ple-Sen
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If you're talking about the Count, you just don't understand. You need to delve into the "pretentious nonsense," not just be drawn to cute characters. I think part of the appeal for fans lies in the philosophy and dark humor, while another part is drawn to characters like Grell. Or maybe some people associate it with the cult classic Hellsing (it's easy to draw parallels). Plus, there's the sad ending. This kind of anime is worth revisiting from time to time to lift your spirits.
1) An immature, spoiled boy lost his parents, then he was marked, and he summoned a demon and made a contract to take revenge. Well, you can attribute this to his young age and Ciel's pathological lack of brains, although it's not entirely clear how he summoned Sebastian.
2) Instead of revealing himself to his relatives, he began preparing for revenge and only appeared after six months (if I'm not mistaken).
3) Ciel himself carried out his revenge by eating cakes, playing chess, and giving orders to Sebastian, such as "go there, find out that" and "kill him," surviving only because of Sebastian's strength, because even thinking wasn't part of Ciel's duties.
4) When the Angel (by the way, in the episode where his memory was rewritten, I was still leaning towards Ash's side, because the goal was noble, although later his goal became distorted, but apparently "so that Ciel wouldn't seem so evil"), rewrote his memory to "cleanse him," Ciel could have become quite normal and reasonable, but he was more attracted to his mental deviations and obsession with "revenge and hatred," and he began to say with a pretentious air that he was so good, "Without revenge, I won't exist, hatred is part of me..." blah blah blah, of course, people can't be completely "good," but he's not saying "a person without flaws is a person" (which, by the way, is a well-known truth), but "Hatred is the meaning of my life, and I don't give a damn."
5) Aberline (by the way, this guy is also charming) sacrificed his life to save Ciel, told him about his fate, and what does Ciel do? He still spouts nonsense about his revenge, etc., and even when the contract is "terminated," albeit temporarily, he still says, "What, did I forget about revenge? How could I, what a scoundrel I am, I must hate!" and it all starts again.
6) The plot is quite absurd, essentially it's a confrontation between "A small, evil, stupid boy VS A maniacally inclined Angel," and the "stupid boy" is rather unconvincingly portrayed as a "Hero" and even saves all of Europe.
If there is any philosophy there, it's for teenagers under the age of fourteen, because there's as much philosophy there as in Hetalia or Chlorka. By the way, there's no philosophy in Hellsing either; it's just a high-quality surreal/action/absurd story. Philosophy exists in Lain, although it's intertwined with mind-bending concepts, in Senpai Doesn't Want Me, although it's only used for humor, even in The Horrifying Tales (manga, the anime adaptation is just terrible) and Gintama. But definitely not in Black Butler. There is dark humor, which I also enjoy. And the ending, by the way, is good; I had been waiting for Ciel's death for so long that I was just glad when he finally died, although I felt sorry for Lau, Aberline, and the servants (if they died).
Added 1 minute ago
After "Rain," I thought I'd get hooked on anime, but no. I looked at the number of episodes in the most famous anime series and was shocked.