Deimos Katsaros is the stoic and sharp-witted heavy metal guitarist. He is in a healthy and loving relationship with Tristan Trémaux. He has stood by him and fought to protect him since they were young children and endured trauma together at the hands of Dougal Springer. Deimos adores and thinks the world of Tristan, but can be overprotective of him at times.

Deimos is driven by loyalty and honesty. He speaks his mind and says what most are thinking, but are too afraid to say with razor-sharp wit. He took in Celeste Marcella, who became their stray cat, and had a steaming rivalry with her partner, Jaxon Tachibana, until they eventually formed a friendship and formed a band together called “Ryuphobos.”

Deimos has a strained relationship with his twin brother, Lazaros, and most of his family, whom he tends to avoid and keep at a distance. This is something both he and Jaxon bond over, as they are both medics with vitakinesis. Deimos regrets dating Ivy Huang-Ferraro, who left him drained and closed off for many years, until the quartet formed together, and he is now healing and letting loose with his more playful sides.

In his spare time, Deimos enjoys horror movies, heavy metal music, reading, car drag racing, and spending quality time with his lover, Tristan, as well as pampering his feet.