What are the voice types of characters in The Mikado?

The Mikado is a light opera in two acts written by W. S. Gilbert and Arthur Sullivan. The opera premiered in 1885 and has been performed numerous times since then. The male characters are:

* Nanki-Poo, the son of the Mikado, a tenor

* Ko-Ko, the Lord High Executioner of Titipu, a bass-baritone

* Pooh-Bah, the Lord High Everything Else, a bass-baritone

* Pish-Tush, a noble lord of Titipu, a baritone

* Go-To, a nobleman of Titipu, a tenor

The female characters are:

* Yum-Yum, a ward of Ko-Ko, a soprano

* Pitti-Sing, a ward of Ko-Ko, a mezzo-soprano

* Peep-Bo, a ward of Ko-Ko, a soprano

* Katisha, an elderly lady-in-waiting to the Mikado, an alto