The Mad Hatter is a resident of Wonderland who Alice Liddell is acquainted with, as she met him during her first visit to Wonderland, along with the March Hare and Dormouse. He remained a fanatic of time, but was no longer the tea party-loving hatter that Alice once knew. From his domain, Hatter began torturing Alice's friends and the residents of Wonderland, transforming many into mechanical automatons. He was later killed by Alice, but revived when Wonderland returned to its former state.

Sometime during Alice's stay in Houndsditch, he became the victim of the Hare and Dormouse, now the rulers of his former domain. All three were killed, although Hatter is seen afterwards, leaving his fate ambiguous.

The Hatter is featured in two songs within Act 1. He does also make an appearance towards the end of Act 2.
This role is more open to be played with, as long as the vocals remain masculine. Feel free to record multiple attempts at the voice, silly and serious, etc.