Did you not keep a Luffy? Anyway, the main units I see missing are the raid characters, but they all come back around so that's not too much of an issue. You're going to want Doflamingo/Enel/Aokiji/etc, as each one has their key uses, but you can manage for now without them, given the dudes you already have.
You can make a pretty good slasher rainbow team with Mihawk as captain and Arlong/Law/Zoro/Doma/Thatch/Suleiman/Whitey (whoever out of these).
Or a striker team lead by Kid with WB/Killer/Urouge/Hawkins, maybe?
You could even run a team with Ray as captain and Hawkins/Leo/Sugar/Mihawk/GP Usopp, with the idea being to stall so you can use their HP reducing specials and finish them off with Sugar. Or maybe WB in place of Hawkins or Leo, I don't know how the mathematics work out there.
I can't speak too much to building teams of fighters or free spirit or whatever, because I generally roll a Ray team as well, purely because it allows for so much freedom in who you take. I think you have all the parts to a pretty solid QCK team already, too. I'd probably continue to run FNs and level the guys you have for now, and maybe experiment with team builds in the training forests or on lower difficulty FNs so you can still get some drops and manuals, etc.
I'm curious to see what builds the other dudes here come up with, as you've got a lot to play around with.
You can make a pretty good slasher rainbow team with Mihawk as captain and Arlong/Law/Zoro/Doma/Thatch/Suleiman/Whitey (whoever out of these).
Or a striker team lead by Kid with WB/Killer/Urouge/Hawkins, maybe?
You could even run a team with Ray as captain and Hawkins/Leo/Sugar/Mihawk/GP Usopp, with the idea being to stall so you can use their HP reducing specials and finish them off with Sugar. Or maybe WB in place of Hawkins or Leo, I don't know how the mathematics work out there.
I can't speak too much to building teams of fighters or free spirit or whatever, because I generally roll a Ray team as well, purely because it allows for so much freedom in who you take. I think you have all the parts to a pretty solid QCK team already, too. I'd probably continue to run FNs and level the guys you have for now, and maybe experiment with team builds in the training forests or on lower difficulty FNs so you can still get some drops and manuals, etc.
I'm curious to see what builds the other dudes here come up with, as you've got a lot to play around with.