XX(名字)的主唱，很帅.翻译成英文

vocal是形容词
vocalist是它的名词,主要指乐队歌手
所以这里用singer可以,不过用这个词更好
至于"主"用main和leading都可以吧
电视剧主角不就是leading role of a play么
所以这里可以翻译成:
The main vocalist of XX is very handsome/cool!

主唱是main vocal， goole上搜索网页查到的用法
这句话翻译为The main vocal of xx is very handsome。

eg The main vocal of Shinhwa is my oppa， Hyesung！

The main singer is XX who is very handsome.

The main singer of xxx is very handsome.

The voice XX is cool.