Ximker is a lean male air genasi with pale blue-gray skin that seems faintly translucent around the fingers. His white hair constantly lifts as though caught in an unseen breeze, and his silver eyes shimmer like moonlight on rough water. Wisps of mist curl around his boots when he is agitated. He wears weathered leather armor beneath a dark sailor's coat, decorated with brass charms, knotted cords, and fragments of sea glass. His arcane focus is a polished piece of storm-worn driftwood wrapped in copper wire.

Ximker is cheerful, superstitious, and fiercely loyal. He treats every journey like a voyage and every stranger like a potential crewmate until proven otherwise. He has an instinctive hatred of bullies and tyrants, but he is also fascinated by forbidden knowledge and will often investigate dangerous mysteries long after everyone else has suggested leaving.

Ximker was born during a midnight squall aboard the merchant vessel Azure Gull. The crew claimed that the storm paused when he first cried, leaving the ship floating in a perfect circle of calm water. His mother, a human navigator, raised him among sailors, rigging, and salt spray. He learned to read cloud banks before he could read letters, and he became a skilled deckhand whose uncanny sense for wind saved the Azure Gull from reefs more than once. His life changed when the ship found a black, glassy island that appeared on no chart. Beneath its cliffs, Ximker heard a voice speaking from the ocean floor, promising the power to command the unseen currents of the world. He accepted the bargain to save his drowning crewmates, but the entity did not grant him ordinary magic. Instead, it opened a door in his mind, allowing him to hear distant thoughts and glimpse shapes moving beyond the stars. Now Ximker serves as a warlock to a Great Old One hidden beneath the sea. He adventures to learn what answered his call, protect sailors from powers that lurk below, and ensure that his patron's whispers never become commands.