Who is Travis O'Hearn from Practical Demonkeeping: A Comedy of Horrors and what is their importance?

Travis O'Hearn is an ex-seminary student who accidentally bound himself to Catch the Destroyer, a demon. Travis is an intellectual accepted into the seminary at an early age, and in the novel, intellect is a quality of goodness. Travis is also around ninety years old, but he looks like he is in his early twenties, since the demon prevents him from aging.