"A former physics student that had admitted himself to the Sparklecare hospital after his previous doctor neglected to help him with his needs. Barry struggles with a poor immune system, and that makes him prone to getting sick really easily. He also deals with paranoia over others trying to get him sick, and has an obsession with science to try and ground himself in reality."

In my opinion, the voice should sound like nasally or like Barney for Dead End: Paranormal Park.

https://www.youtube.com/watch?v=kEIQbtWYqk4