Jaunt is a Dimensional Shambler currently residing in Innsmouth - he is the "Kook of Whippoorwill Manor", a cliffside estate of simple design with an odd statue in the rotunda.
Most of Innsmouth's residents are unaware of his existence, as he only reveals himself to those more dedicated to the cause of the Esoteric Order of Dagon. Those close to him know that he has dealings with Nyarlathotep, so his motivations are not exactly clear. What is known about him is his work keeping the cross-breeding of the town a secret, as well as his hobby of collecting artifacts from R'ylyeh and other strange corners of the hidden world.
He is fast, he is intelligent, he has sharp claws and commands the innate ability to shift between dimensions - he naturally fell into a position of leadership.