Here's a few of my favorite Copic colors to use. I hope you find this helpful. When I get more I'll add them.
I use Cryogen paper when using Copics.
I use Memento Ink Tuxedo Black or for the "no line technique" use desert sand.
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Skin - E0000, E000, E00, E11, E13
Cheeks - R32, R30
Dark Blonde - E44, R43, E42, E41
Light Blonde - E55, E53, E51, E50
Brunette - E29, E25, E21
Pinks - R81, R83, R87, R89 or RV00, RV32, RV34 or R30, R32
Blues - B91, B93, B95, 97, B99
Blue/Green - BG72, BG75, BG78
Green -YG91 YG93, YG95, YG97 or G20, G21, G24, G28
Orange - YR15, YR14, YR12, YR00 or E99, E97
Purple- V17, V15, V12, V01, V00, V000, V0000 or V91, V93, V95, V99
Red - R32, R35, R37, R39, R59
Yellow - Y21, Y23, Y26
Crisp White - N0, N1, N3 and a tiny bit of N5
Vintage/Shabby Chic White - W00, W1, W3, W5 -this is mostly what I do for my spotted backgrounds.
Black - N9, N7, N5 a little N3
If you have a suggestions or comments on a color combo let me know and I'll post it here. :)