3D character model, Garry's Mod, player model creation, T-pose, rigging, Valve's Source engine, Blender, 3D modeling software, texture mapping, UV unwrapping, custom animations, physics model, collision mesh, Lua scripting, addon folder, Steam Workshop, in-game testing, ambient occlusion, realistic materials, gaming environment, interactive, modding community, detailed instructions, step-by-step process, character customization, digital art, creativity, gaming culture, online multiplayer, sandbox game, player expression, character skin, unique identity.