The main vocalist of NCT U is not fixed because NCT U is a rotational unit, meaning its members can change depending on the song. However, one of the well-known main vocalists who has been part of NCT U is Taeil, who was born on June 14, 1994, in Seoul, South Korea.
Taeil is no longer part of NCT due to some issues, but he was an important vocalist in the group.
Another key vocalist in NCT U is Kun, who was born on January 1, 1996, in Fujian, China. Kun is also part of WayV, another group under the same management as NCT.
Additionally, Doyoung is another main vocalist who often participates in NCT U projects. He was born on February 1, 1996, in Seoul, South Korea.
These vocalists have contributed to many NCT U songs over the years.