There are a few different official sets of Copic Markers skin tones numbers, as well as some great bespoke sets you can make yourself.
Copic Ciao 6 Marker Set - Portrait
Copic Markers Skin Tones Numbers Copic Thinking, 52% OFF
Copic Markers Skin Tones Numbers Copic Thinking, 52% OFF
COPIC sketch マーカー スキントーン - アート用品
Using Copic Markers - HubPages
E13 Light Suntan: Copics Uncapped (Marker Swatch, Ink Testing) — Marker Novice
COPIC sketch マーカー スキントーン
COPIC markers are versatile double-ended refillable markers with fast-drying, permanent non-toxic ink. The Sketch marker features a comfortable oval barrel with a super brush nib on one end that is perfect for doing professional illustration, fashion design, Manga, and adding detail to your images. The Sketch super brush nib acts like a paintbrush, both in feel and color application. For more control, use the medium broad nib on the opposite end of the marker. Both nibs are replaceable.
Copic Sketch 6-Marker Set Skin Tones 1
ohuhu colors most like the skin tone copics I have so far. : r/AdultColoring