Explore a character design where a young girl, featuring black bob-cut hair and chibi style, dons intricate black armor. She holds a sword behind her back and has playful devil horns, giving her a mischievous appearance. Her unique features include a long neck, cross-eyed expression, and extra fingers, contributing to an otherworldly charm. Her expression and stance suggest a sense of privacy and mystery. The image should be in high detail, capturing UHD quality with rich HDR effects. Avoid any low-resolution issues like blurriness or artifacts, ensuring the character is the focus without clutter such as logos, text, or watermarks. The setting frames her perfectly without elements being out of place or cropped, maintaining a clean and engaging composition.