Techpriest Toastus

"'Where are the toasters you promised us?'"Techpriest Toastus is a member of the Adeptus Mechanicus assigned to maintain the Emperor’s Golden Throne.

TTS Canon
Toastus has been present in the Emperor's throne room for at least 500 years. It can be assumed that he's part of the staff that helps maintain the Golden Throne.

Toastus installed the Text-to-Speech device onto the Golden Throne for Kitten, in exchange for toasters as payment. However, Toastus never received his toasters, and continues to harass the other characters for payment.

Toastus sometimes finds random items, such as lead pipes and liquid nitrogen, and throws them onto the Emperor as “offerings to the Omnissiah,” causing the Emperor significant pain.

Toastus accompanied Shield-Host Proteus to Mars, hoping to finally find the toasters he was looking for.

Quotes

 * "I found a PIPE!!!"
 * "mrräöögghggg sexy bloated containerggh"

Trivia

 * Toastus went unnamed until episode 28, despite being present as far back as episode 1.