Dexter is 

The voice actor needs to be able to perform vocally as a character, using their vocal tone to convey emotion. They should also have experience with acting methods and be able to make last-minute adjustments.

Demo Lines:
1."The time has come! We shall make room for our beloved gods and claim what’s rightfully ours… It’s time to summon The Dark Ultima… *evil laugh*"
2. "What is it, Miki?"
3. "Let’s just say… I have someone on the case…"