Create a minimalist isometric 3D illustration of a single custom 1u mechanical keyboard keycap installed on a warm light-brown woodgrain keyboard case. The keycap features an original chibi doctor or healer-themed character, compactly sculpted within the standard 1u keycap footprint. The character's body and head form the main pressable top surface, while small gourd or short tool-handle details are integrated into the overall silhouette without protruding too far to the sides. Carefully preserve the pose, clothing details, gentle quiet temperament, practical usability, and keyboard mounting compatibility within the limited keycap space. Use soft lighting, polished toy-like 3D materials, and a clean product-render composition. Avoid real characters, franchise references, logos, readable text, keyboard legends, UI chrome, and watermark. Output aspect ratio: 1:1.