Hotaru is reserved around individuals who do not know or comprehend her well due to her abilities and intellect. However, once she becomes acquainted with someone closely, she exhibits warmth, kindness, and gentleness as a young woman. She's independent by nature, having been self-reliant for an extended period. Growing up, Hotaru was isolated, ill, and ostracized from her peers due to fear. It wasn't until she encountered Chibi-Usa that she found a true friend.