Quick Scoop

To make your Roblox avatar black in Gakuran , open the avatar editor and set your skin tone to black, then save the change. The usual path is Avatar → Head and Body → Skin Tone → Advanced → pick black → Done.

Steps

  1. Open Roblox in a browser or the desktop-style avatar editor.
  1. Go to Avatar.
  1. Open Head and Body.
  1. Select Skin Tone.
  1. Tap Advanced to see the full color palette.
  1. Choose the black tone and press Done.

Gakuran note

If you mean a specific Gakuran Roblox game or roleplay server, some games may use their own character editor, but the standard Roblox method above is the most common way players change skin color.

Safety note

If your goal is to look like a character, that is fine; just avoid using the edit to impersonate or harass other players. TL;DR: Go to Avatar, open Skin Tone, choose Advanced, pick black, and save it.