Phileas...I had a pretty good idea of what, or rather who, I was looking for. I just had to go looking through a lot of images to make certain.
For Phileas - James McAvoy.
Yeah, the dialect will be hell, but if he can handle playing a faun, he can handle pseudo-Yorkshire. I just hope he looks "scallywaggian" enough to suit the boy.
Dandill - Jamie Bamber. As Pill put it, "pretty and tough."
Destril, I'm rather stuck on, unfortunately...it's so hard to find a variety of talented actors who happen to be gingers and can pull off those heartbeat changes from sweet to snarling that Des seems to have developed. We'll see who I can come up with.
Kei's not being simple to catch, either. Silly Brat.