Ernest is supposed to be annoying and unlikeable. He's basically your "milady", tip your fedora, DM you at 2 in the morning because he's lonely type of guy. His voice should be shrill, a bit nasal, very whiney. If you need any inspiration, think of an adult Urkel. 

He's a character exclusive to this story, so I likely won't be asking any to reprise their role (not to say I won't ask you to be apart of other projects, just not to reprise this role).