A-lun (あーるん) is an utaite who is a member of the group Prince Kingdom (also known as Puridamu, in short).
His voice may be naturally high-pitched and shota-like, but he also has quite a flexible and wide vocal range, which allows him to cover songs in their original keys. For example, in his cover of "Schema," he sang it in its original key with his lower and arguably attractive range of voice, which involves the use of his chest voice. In his cover of "Elite," he sings it with a mix of a lower and middle vocal range, with a bit of his higher range in some parts, especially in his background vocals during the chorus, and yet he does it all while singing with his chest voice. In his cover of "Comparison Syndrome," he sings it with a mix of his middle and higher range. Overall, A-lun's is quite skilled at utilizing his chest voice, especially to reach higher vocal ranges, and it also explains his signature "shota" sound.