Isuki Ishida is a second-year student at Seiou Academy, where she is part of the Faculty of Geochi, a specialization that aligns with her deep interest in earth sciences. She is seventeen years old and has a notably small stature, standing at 146 centimeters tall. Her appearance is characterized by green hair cut to ear-length and brown eyes, and she is often seen wearing the standard school uniform with a ribbon tie. A distinctive feature of her look is an ammonite-shaped hair ornament, which she considers very important.

Personality-wise, Isuki is bright and energetic, and she is almost always seen with a cheerful smile. Her enthusiasm is most apparent when the subject turns to her greatest passion. Isuki is single-mindedly focused on fossils and ancient creatures, and her excitement level increases significantly whenever she encounters fossils or gets to talk about them. This passion defines her daily life and her goals. Her favorite subject in school is geoscience, and she is a member of the Geology Club, where she can pursue her interests alongside like-minded peers. Her hobbies directly reflect this focus, as she enjoys digging up fossils and engaging in die-cutting, a craft that might involve shaping materials, possibly related to her fossil collection or other creative pursuits.

Her motivations are rooted in her love for paleontology and geology. She is driven by the joy of discovering and learning about ancient life, and her character evolves as her relationships and experiences progress. When it comes to personal tastes, she has a fondness for lollipops but holds a strong aversion to water. This combination of a focused, academic passion with a playful and energetic demeanor makes her a distinctive presence in her school environment.