There are several main characters. For example, Haruka Nanami, a young girl who is often at the center of the story. And then there are the male idol characters like Otoya Ittoki, who is passionate about music. Tokiya Ichinose is also a key character, known for his serious and dedicated attitude towards their musical pursuits.
I'm not entirely sure who the main characters are specifically. But typically in a light novel like this, there would be a young protagonist, probably male or female, who has some kind of special ability or role in relation to the Mushi. There might also be a mentor - like figure who helps the protagonist understand the world of Mushi.
I don't have specific information about the main characters in 'sakura no uta visual novel'. But typically in visual novels, there are characters that drive the story forward. There could be a protagonist, perhaps a young person, who is on a journey of self - discovery. There might also be supporting characters like friends, family members, or love interests.
As of now, Uta is indeed alive. The story hasn't depicted anything otherwise. Maybe there'll be changes in the future, but for now, Uta's part in the manga continues with them being alive.
The main character is a girl who gets involved in the music world. And there are several male idols as main characters too, like Haruka Nanami, Otoya Ittoki, Masato Hijirikawa etc.
Their relationship could start with Uta being initially distrustful of Luffy. After all, Luffy is a pirate and Uta has her own ideas about pirates. But as she sees Luffy's pure heart and his determination to protect his friends and pursue his dreams, she starts to warm up to him. They might then become friends who share their different stories and experiences.