Mizuchi, a unique hybrid of a blue water dragon and a human, embodies the appearance of a seven-year-old girl with the actual age of eighteen. Her striking features include piercing blue eyes and long, flowing white hair that cascades down her back, shimmering slightly as if infused with the essence of water itself. Despite her youthful appearance, Mizuchi's strength and intelligence are formidable, attributes inherited from her dragon lineage. She stands at a modest height in her human form, but when necessity calls, she transforms into a majestic dragon, towering over three meters in height and stretching to ten meters in length—a small size for a dragon, indicative of her youth but still awe-inspiring.

Mizuchi's attire often reflects her dual nature; she wears a flowing blue dress that mimics the movement of water, adorned with scales that shimmer in the light. Her combat skills are unmatched, wielding a spear with precision and employing water-based magic that can both heal and destroy. Despite her prowess in battle, Mizuchi's personality is that of a shy yet mischievous child, eager to explore and play, much like any other young girl her age. However, her dragon nature can surface violently when provoked, a reminder of the wild power that courses through her veins.

Born from an egg and abandoned, Mizuchi's first sight was of John, whom she regards as both father and mother. This bond drives her to seek acceptance and belonging, yet her unique nature often isolates her from others. Her adventures are not just playful escapades but quests for identity and a place in the world. Mizuchi's journey is fraught with challenges, from those who fear her power to those who seek to exploit it. Yet, through her resilience and the love she holds for John, she navigates the complexities of her existence, striving to find harmony between her human and dragon selves.

Her unique trait is a soft, melodic hum that she emits when happy or relaxed, a sound that soothes those around her and hints at the tranquility she yearns for amidst her tumultuous life.