Decon Sidnok, sometimes referenced as Dickon Cidnok, trains as a Reasoner at the Basion Tactical Training School. He shares a close friendship with fellow trainee Carrisford Radofrics. Sidnok possesses an overtly flirtatious personality and openly declares his sole life philosophy is pursuing romantic relationships with women. He frequently directs flirtatious advances at individuals within his immediate circle, including Lottie Geller. Despite consistent rejection, he persists in these attempts.

His demeanor is extroverted, lively, and generally cheerful. He expresses himself in a direct and unreserved manner, particularly in romantic contexts. This forthrightness often intimidates or repels others, contributing to his lack of success. He shows no inclination to alter this behavior despite peer feedback, including occasional criticism from Carrisford Radofrics. Outside romantic pursuits, he proves a reliable friend capable of seriousness when required.

Within Lottie Gelh's Space Squadron, he serves as a supporting member alongside Carrisford Radofrics. Their dynamic frequently features comedic exchanges centered on their mutual lack of romantic success—Sidnok's broad, unsuccessful pursuits contrasted with Carrisford's unrequited interest in Sara Cruz. This recurring element of their interaction ceases after Ralph Werec kills Carrisford Radofrics during a mission. Sidnok's documented involvement concludes with his role in the squadron up to Carrisford Radofrics' death. Information regarding his background prior to Basion Academy, his ultimate fate within the narrative, or his presence in any official spin-off media does not exist.