Motoko Kaga possesses long purple hair flowing to her waist and violet eyes, with some references noting blue. She presents as an adult with a slender build, typically dressed in a blouse and belt. She shares a significant past with Akuji Yamamoto, having been his lover before his military conscription. Motoko personally saw him off at the harbor, clinging to his promise to return. His prolonged absence and eventual return marked by profound personality changes created confusion and emotional conflict for her. Despite his transformation, unresolved feelings for him remain. Her demeanor is predominantly cool and collected, yet punctuated by intense jealous outbursts, often triggered by Akuji's recruitment methods involving sexual relations with new members. His transformation strains her unresolved feelings, creating significant internal turmoil. In combat, Motoko employs a whip as her primary weapon, wielding it with considerable proficiency to deliver precise and forceful strikes. Her role involves navigating interpersonal dynamics stemming from her past relationship while adapting to Akuji's changed circumstances and leadership approach.