Hey another teacher, well librarian actually. XD The idea just popped into my head and couldn't help but use it. So many characters but then again the teachers are going to be more of just NPC characters, or rarely used when necessary.

Name: Sealamet the Wise
Age: unknown, but basically nearly ancient
Species: Dragon
Subject: Librarian 
Appearance:
Human form:
http://ximena07.deviantart.com/art/Hello-Ser-Cousland-310194844
True Form: Except gray in color and scaleless
http://argetlam350.deviantart.com/art/Two-Red-Dragons-125188772
Powers: Breaths fire but comes out as blue flames, slight dabble in magic
Bio: Sealamet is a rather unique dragon in that he is scaleless, a rare trait that isn't commonly seen in dragons. Though this means he has a lack of protection when compared to his scaled brethren, it gives him an advantage in flight, being more nimble and not having scales to weigh him down. His age is unknown but he enjoys telling stories which basically tells people he is rather ancient dragon. He came to the school when it was new and took the position of librarian in order to protect rather ancient artifacts and scrolls he had collected and now are available in the library.