Hi all, I'm looking for another champion to play solo top mainly for solo queue. I'm currently learning Riven, but I'm also considering picking up Jayce and Nidalee. Any suggestions for other champions to learn for top?

noone as you will very rarely get solo top (either because someone will go "solo top or feed" or because there's no jungler).

Learn some champs for every lane.
For solo top,
AD: Jarvan, GP, Lee sin, Olaf , Panth
AP: Cho, Nunu, Morde, Shen, Singed, Teemo (AP/AS)

Too many to list. I listed my favorites.