Hey there. I took part in Beta3 and created 4 characters. The customization of the characters is pretty in depth. You can change everything from height to the shape of your face, the tilt of your eyes and so on. As for gear, the only thing I noticed was a vendor that sold dye. I baught a few of them, and was able to succesfully color my characters clothing. I did notice that only part of my leather chest item got colored, and I could not color my leggings. Either way, I was very happy to see the dye atleast!
If by black you mean "very dark brown", that's an option for Eth characters. If by black you mean "some shade of charcoal", that's possible in creating a Kelari (elf). Other options may exist in the depths of the character creator but those are two concrete examples.