What are some good champions that are fighters, that i can play top lane.

play juggernauts if you're a real man

Renekton, Fiora, Irelia are each good.

Nasus & Renekton are two that spring to mind. Darius. Illaoi. Pantheon. Fiora. Both Rengar and Warwick can be made to work, if you're good enough with them. Poppy and Maokai are viable picks, though a bit more on the tanky side of fighter.

Nasus can be played either Q stack for that late-game hypercarry, or E-max if in an unfavourable matchup. For the latter, get zzrot early to maintain pressure in lane while you roam and try to apply pressure elsewhere in the map (remember to still Q stack as much as possible).

Renekton, Darius and Illaoi are lane bullies. Try to get ahead early game then snowball.

With both Poppy and Maokai, stay even in the laning phase, then help your team crush teamfights with the disruption you can cause. If you get ahead in lane, maybe with some help from the jungler, well, you can be an unkillable monster in the back line and carry the game.

I don't know too much about Rengar or Warwick top, but I suspect both will try to bully the lane, then spend much of the mid-game roaming to other lanes to apply global pressure. Also, from what I've heard, if you fall flat on these champs, you'll be useless for your team.

Fiora is a fighter too, but has a high skill floor and cap. Don't unless you're really good.

Pantheon is probably a bit easier mechanically than Fiora, but you must snowball or be useless