Dave (Not his given name) is a member of the Royal Imperial Mananauts, Tamriel's former (Emphasis on former) leading experts on interplanetary travel and navigating the planes of both Oblivion and Aetherius. 

Dave is an young male Imperial scholar, who acts as the "community outreach" portion of the Mananauts, meaning he tries his best to act polite while simultaneously being yelled at by his superiors and fetching their equipment when they bark at him for it. He doesn't let this get to him though, as he knows they know that THEY need HIM more than HE needs THEM.

As Dave will be bouncing off another character who has much more of an extreme personality, Dave will be used to put his superiors irate comments and general grumbling into sharp relief. As such, try to keep a generally calm and somewhat monotonous tone, almost like you're trying to keep a young child focused on a task you've asked them to do without TELLING them to focus on said task.