For me, it's Rouge et Noir series. Maybe, because it's one of the earliest otome I've listened, so I don't get bored listening to the same tracks. The story are also interesting and the seiyuu acting are really good
At first, I like Zayne because of his character trope, my favorite grand Duke of the north type. However, I got bored later and I uninstalled the game. I only came back when Sylus is released. His marketing ads are insane, and the character is really interesting.
In Mr Love: Queen's Choice game or Love and Producer Anime, there is a male lead character called Lucien who is a doctor. He's kind of mysterious and interesting.
I think the cover art does play a significant role in trying to lure fans to buy it. Some covers are too brutal or not aesthetic enough will also turn off some people because we do look at the packaging first.