Despite being the most common upper limb prosthesis, body-powered devices lack presence in the customization market, contributing to high abandonment rates. MORPH introduces a modular casing system that brings identity, adaptability, and convenience to users. Its disconnected upper and lower arm casings support both transhumeral and transradial prostheses, with finishes ranging from muted to bold. A pinch clasp enables one-handed, secure attachment and quick release. Designed to work around cables and components, MORPH avoids interference while worn. The casings nest for compact storage, allowing users to carry and switch looks easily—blending function and self-expression in everyday prosthetic wear.