Entropy

The most emo dark lord you ever did see.

In all seriousness, the skin and hair colours are significant. The more devoted to their respective 'thing' (order or chaos) Entropy and Samsara get, the more their colour contrast grows. Entropy was wholly, slavishly obsessed with order, so his skin is bone-white and his hair, uh, black. Samsara has the reverse (dark skin, light hair)...but since she has a little bit of order in her despite being mostly chaotic (which is why she's, y'know, even coherent), the contrast isn't nearly as great. As you can see in her picture, which I'm gonna upload right after this one.