What is the hormone responsible for the development and maintenance of female secondary sexual characteristics is?

The main androgen is Testosterone with increasing levels that begins Puberty and the Secondary Sexual Characteristics in males. Testosterone is produced in the testes. It encourages growth and maturation.

Also important to mention is the Follicle-stimulating hormone (FSH) which enhances spermatogenesis.

And, Dihydrotestosterone (DHT) which similarly to testosterone, is a male reproductive hormone that helps the external genitalia to grow and become fertile.