Suchak is a sky-priest, one of the serpentine mountain dwellers of Golarion's sister planet, Triaxus. While most of his people worship Gozreh, and credit her with the creation of the wind and sky, Suchak follows what he believes is a higher goddess: Desna, who created the heavens themselves that Triaxus spins through in its erratic orbit.
Suchak left his people as soon as he was old enough to do so, and never looked back. He wandered for years, simply exploring and honing his skills with his chosen weapon (the Starknife, the favored of his goddess). He became powerful, and skilled, but was not prepared for what happened a few years into his travels. He met up with three companions, a plainsdweller named Horn, the poet-whale illusionist Podrick, and a Winter Guard (a construct creature) who was simply known as Aught.
They stumbled across a plot by an insane playwright to send Triaxus hurtling across the planes into Carcosa, the domain of the Great Old One Hastur. The group managed to thwart the plot, Aught giving his life in the process, and parted ways as heroes, never to meet again.
Suchak was forever changed by his encounter with madness. Where before he had explored for exploration's sake, and still did in part, he carried with him a seed of paranoia, always worried that something similar would come to pass and he wouldn't be able to stop it. He routed out Aberrations wherever he came across them, and destroyed them mercilessly. After a while, it became apparent that his encounter with the portal to Carcosa had changed him in a different way: He was now more attuned with the underpinnings of the universe. Planar travel became opened to him, a gift from his goddess, or so he believed.
He began the third stage of his life traversing the Grand Stair, embarking on the greatest journey of several lifetimes. Suchak had never felt such a sense of fulfillment. There was always something new around every corner, through every door. Entire planets and planes he's seen, and he plans to see more.
Motive: Suchak desires nothing more than to see all there is to see in the multiverse, though he is also committed to stopping the encroachment of the Old Ones into this universe. While they may bring new things into being, he has no desire to see their twisted creations take over and defile the beauty of any more planets and planes than they already have.
Appearance: Suchak is tall, though much of his height comes from his elongated neck. With his neck extended he tops 7 feet, but his body is maybe 5' 10" alone. His scales are green as spring grass, and his eyes glow blue with magical power, a gift of his bloodline that lets him see magic. He wears comfortable, well fitted clothing festooned with vials and pouches within easy reach. Suchak disdains true armor, trusting in a weak force barrier and his own natural dexterity (augmented by alchemical mutagens) to keep him from harm.