Eiji Higa is a fish caretaker at Tingarla Aquarium, joining the staff following his graduate studies. He has grey hair, purple eyes, and wears glasses. Possessing extensive knowledge of marine biology, Eiji exhibits a deep fascination with aquatic life. This expertise leads him to habitually relate people and everyday situations to sea creatures, drawing serious yet unconventional comparisons. He works within the Aquatic Animals Department under supervisor Kaoru Shimabukuro, collaborating with colleagues like Kuuya Yakamashi and Gousuke Gonden. Eiji maintains a generally calm demeanor but becomes notably animated when discussing fish or marine topics. His professional duties center on practical aquarium maintenance and animal care.