Mr.Daniels is a terribly pessimistic character, a lot of students assume he hates teaching but in reality he adores his pupils as much as Susan does: Daniels just isn’t as good as expressing it. He does get easily irritated but he won’t ever hold a grudge. Unless it’s towards Brock.

Voice wise, Daniels has no specific pitch, as long as you can fit his lack of enthusiasm and subtle annoyance in his voice the pitch doesn't matter.