You’ll see three sliders for Red, Green, and Blue (0-255). Some versions have a color wheel. Pick the exact shade you want for Mario’s overalls, shirt, or cap.

: Check the box for your new cheat and load your save file. Mario will now appear in your custom colors. Why Real Hardware is Different

The is a specialized utility used primarily by the Super Mario 64 modding and machinima communities (such as SMG4 fans) to customize the color palette of Mario's 3D model. These tools generate hexadecimal strings that can be injected into the game's memory—typically via emulators like Project64—to create unique characters or "recolors." Core Functions and Usage

Advanced tools like M64MM (Mario 64 Movie Maker) and Saturn feature built-in, real-time color editors, removing the need for external code pasting. the404devs/sm64code: colour code generator for ... - GitHub

You don’t need to be a programmer. The interface is as simple as using MS Paint. How to Use the Generator

Often linked together as the primary outfit color. Overalls: The secondary outfit color.