Anyone wishing to audition for Iida should strive to have the following qualities to their voice:

• Strong articulation
• Mid-to-low range
• A formal character tone.

You must also be willing to seriously use the pet-name 'Princess' as this is how Iida addresses the café patrons. 

Though I'm not looking for impersonation, per se, the following video should give you an indication of what I'm looking for: https://www.youtube.com/watch?v=GbZo2vHInAw 

Synopsis of the role:

After going through the entrance desk, the listener climbs the stairs to the café where Iida is there to formally welcome her. He then takes her to her seat, tells her that her personal butler, Mashirao Ojiro will be along shortly, then returns to his post at the door.

He is professional and fully committed to his role of a butler, striving to give a 100% smooth, relaxing and welcoming performance. To that end, you should also be equally committed. It might make you feel silly, but if it's done right then the listener's will never know and we'll both have a performance to be proud of.