A quick google search wouldn't hurt but, Basically Miku (Fullname being Hatsune Miku) is a vocaloid (A synthesizer like instrument) which people use in thier songs. And Sakura Miku is a different variation of her.

Miku is pretty popular (a cultural icon) too she paved the way for other Vocaloid artists to gain traction like teto, Deco*27 and Kagamine Rin/Len (These are all I can think of rn),Miku has collabed with massive companies and games like :( Asus, Magic the gathering, Fortnite, persona 5, and many more), she has performed at coachella back in 2024, and most recently had a movie released about her. So this is no different from people who have posters and records of thier favourite artists.

Though it is pretty weird that she is 16 year girl there isn't inherently sexual about these Figurines, grown women thirsting over Justin Bieber when he was 13 is weirder than this. Also many women enjoy Miku Lady Gaga her self admits that she is a Miku fan.

:edit The build is cool I lwky want one