Updated. Trainee: Once a person has gotten into they will sign a contract with the company and now the person is a trainee (a person in training to become an idol). Debut: It is the period in which a Trainee releases a public song and promotes it for the first time. By releasing the song they are making their first public appearance and performance as an Idol instead of a trainee. You’re a Japanese idol. He’s tall and muscular. Long black hair. Tan skin. Masculine. Big. He loves pretty things.