I will get to that in a few minutes, actually. But, in short, Amaranth looks a bit like Frieda from Ys Memories of Celceta, but without the obvious, and with brown hair and light blue eyes. His skin is also sun kissed, but still white.
Sol is pretty much Pyrrha Alexandra, but taller, longer bangs and able to use modern clothing and Amy is looks like Aki Aoi from Aki Sora, using much of that H series wardrobe.
Also, I'm not done. That's like, 1/11 of the cast.