Rakko, a sea otter, possesses a pale yellow body with black ears and limbs, marked by a cross-shaped scar above the right eye. They always wear a white cloak and bear a large greatsword strapped to their back. Professionally, Rakko specializes in high-risk monster subjugation and holds the top rank within the fictional United Assassins Association, showcasing exceptional combat skill. Paradoxically, they struggle significantly with online fighting games. Rakko harbors a distinct fondness for sweets and desserts. They own and operate a car, frequently providing transportation for Chiikawa and Hachiware. As a mentor, Rakko undertakes training responsibilities for Hachiware. Though background details are sparse, Rakko demonstrates deep reverence for a memorial park statue, having once vowed there to pursue greater strength. When Chiikawa and Hachiware formally address Rakko as "sensei," they react with visible emotion, promptly sharing this development with the statue.