F1

「THE OTHERS: #1 MIKU HATSUNE」
(Status: alive, sane - Species: humanoid - Linked to... Tei Sukone)

Miku Hatsune is probably the most popular virtual singer in the whole world. And it's not surprising she became Tei's rival. But what is exactly the reason why Tei hates on Miku THAT MUCH, to the point to even ask Nynthixia to never EVER invite her to the castle? Two reasons. First, she suspects Miku to be so close to Len that she would be... Len's lover. Quite the false idea, but oh well, we're talking about Tei here. A girl who was born yandere and stuff. You know the drill. Second, her status of most popular singer. Seems Tei is not only jealous for love reasons after all.
Miku is a humanoid singer who started her career back in 2007. She wasn't the first one to do so, but she quickly gained in popularity, even faster than other comrades of her own cluster. It's very simple, her cluster is among the first ones in Japan to have popped up.
Also, it seems Nynthixia has her reasons to not invite Miku. Not that she hates her, but for some reason, Nynthixia wanted to give more potential to girls who weren't at the very front of the scene when they got invited. There is also the question of the price of the invitation ticket. Nynthixia judges it a bit too expensive for what it is...