Brendan, head of hufflepuff house, and professor of COMC, is a FAIRLY mild mannered individual. In his mid twenties, Brendan lives in an old mansion in the middle of a small lake, half of his housing submerged by water. He is incredibly skilled with dealing with magical creatures both evil and benign, an accomplished duelist, holds no recorded specific affiliations with either the Order or the DEs, and has a dog named sprocket. Raised in a half muggle, half magical household, he is well acquainted with the muggle world, and learned to use magic at a very young age. Though he is kind generally, he's got a flashy streak of harshities and pride to match and possibly outwit any Death Eater.
In addition to teaching in the school, he is a cooperative with the school of werewolves hidden somewhere I wont tell you about, and enjoys rum... lots of rum.