Sorry to sound disappointing, but I think maisie is more of a RT while horatio may either be a RT or a young VT, felix's picture isn't too clear (tail not open). Deltas and HMs are not rounded like that but rather pointed (?) ... (look at dramaqueen's or my avatar). So you will likely get rounded tails as well. If they came from a HM/Delta line, you may get 1 or 2 deltas.
As for colors, I would breed the first pair because they originally came from the same line (green and copper). I think Felix looks like a platinum which I know little of (different people say different things about their origin and I have yet to discover by experience). If you breed the first pair, you should get both green and copper with red wash. Some may also be sort of light metallic green. I'm not sure what you'll get from the second pair.
Recently I bred gold fins with gray/copper wash on body (newly bought) to a pure copper female (my own line); resulting in dark copper, some with red wash fins.
I hope this helps. Good luck.