Notes:

These are the children of Fates in their neutral mother's (from top to bottom Aqua, Felicia and Mozume) hair color.

The children listed from left to right are as follows

Deere, Eponine, Foleo, Gurei, Hisame, Ignis, Kanna (F)
Kanna (M), Kinu, Kisaragi, Lutz, Matoi, Midoriko, Mitama
Ophelia, Shara (or Syalla), Shinonome, Siegbert, Soleil, Sophie, Velour

So in your opinion, which hair color looks great on what kid and what hair color looks like s--- on what kid?

The Children of Fates in the hair colors of all their mothers can be found here.