I main every hero really. It's required for tournaments such as VMS. But I like Ringo very much as laner, Ardan as support/jungler and Krul as jungle (he's coming back in meta due to turrets shield and games that last longer than before. He can get his full build and wreck teams if well played.)
For builds, you can go on vaingloryfire. But the best is to create your own build.