Try Nasus brother they have different play styles but they both feel fairly similar. But if you play renekton don't just farm like you do with nasus you should bully your laner and steal their lunch money. Then buy a hydra with their lunch money.
If you prefer passive lanes like nasus provides then try mundo and stand back by your tower and throw cleavers to last hit like I do. All about the late game with mundo. I like doing this playstyle against the popular lane bullies because they have 0% chance of killing me or even harrasing me and even if they do i'll just heal it up. We will end up with equal amounts of cs when we come out of the laning phase but ussally i'll have 1-2 kills because of a gank while I can't be ganked because i'm camping tower but the keypoint is that you scale great into late game while lane bullies don't. Remember to always get teleport if your doing a passive lane so your not just a burden to your team and also, try to gank mid lane everytime you have the chance. Remember to tell your jungler to focus on other lanes for the most part. When I play a passive lane the junglers ussally do more harm then good when they come so I really try to get them to camp mid and bot.
I hate getting ganks when i'm playing a nasus I just want to camp turret and cs nonestop.