Okarun is a short, slender teenager with unruly brown hair (black in the anime) and brown eyes hidden behind round-frame glasses. His once-neat bowl cut has become messy after his encounter with the Flatwoods Monster, and his frame has grown more toned from relentless strength training and battles against spirits and aliens. He typically wears his school uniform. Beneath his unassuming appearance lies a deeply self-conscious and socially awkward individual, haunted by a childhood of bullying and isolation. His consuming passion for the paranormal—especially aliens and cryptids—stems from a desperate attempt to make friends, though he still struggles with low self-esteem and believes he doesn't fit in.