Top lane
what champions for this pool should i take for top and why -

or do you have any other champions to suggest?
what champions for this pool should i take for top and why -

or do you have any other champions to suggest?
GP's your best bet because you can flex mid as well and focus only on him.
If you want to specifically top, Darius or Riven. Either works.
GP's VERY matchup dependand, and takes a lot of games to get good at, and not exactly the best right now. Riven is very similar in that regard
Fiora and Jayce are a lot easier to pick up than GP or Riven, allthough still not very easy.
Darius is not that hard, and pretty effective in lower ELO's
I recommend learning a tank like Poppy or Maokai aswell so you have something to play in painful matchups or when your team does not have a frontline yet.