Marina Unami is a 23-year-old teacher and qualified counselor at Tateyama International Senior High School in the anime Kuromukuro. She has long brown hair and purple eyes. As a counselor, she is eager to help students navigate their personal and academic challenges, but she often frets over the fact that very few students come to her for advice, which reveals a degree of insecurity and a desire to be more useful in her role. Her personality is characterized by shyness and a gentle, supportive nature. She is not a frontline combatant in the series' alien conflict but instead fulfills a supporting role within the school setting. She develops a friendly rapport with the main characters, particularly Yukina Shirahane and her best friend Mika Ogino. Marina becomes actively involved in Mika's cosplay activities, helping her film a fan movie, which demonstrates her willingness to connect with students outside of formal counseling settings. She also serves as a chaperone on several class trips and school-related outings, maintaining a watchful and responsible presence. Over the course of the story, she gradually becomes more comfortable in her position and more engaged with the students' lives, reflecting a quiet personal development from a frustrated counselor to a more confident and integral member of the school community. Her notable ability is her professional qualification as a counselor, though her greatest growth comes from learning to apply that skill in meaningful, practical ways.