"The brooding and grumpy twin of Nurse Mood. Doom hates pretty much everything and everyone, and is very unhappy with himself and his life. He especially hates his job and his boss, and would much rather be spending his time doing other things... but life doesn't really go his way. Essentially nobody in the hospital actually likes him (except Mood and Uni) and the feeling is often mutual. He spends most of his free time away from this horrible job by himself, trying to cope with his misery from the situation he's in."

Grumpy, gruff voice ideal. Speaks in all caps, do what that means to you. 

Doom's voice reference https://www.youtube.com/watch?v=ekJaOFvpgS8