A Breather is the name Vampires give to humans. Vampires hate breathers and bite them for sport, joy, bets, thirst and instinct. Other names for breathers are Mortal, Human, Not-Vampire or Red-Face. They have regular teeth, no crave for blood, a heart beat, mortal lifespans (not living forever), breath and many other things a Vampire doesn't have. During the youth of a Vampire they are essentially a breather but when they turn 16 they go through The Transformation.
Humans with special powers
Witches and warlocks have been mentioned but never seen in the series.