So the thing about kiting is that there are quite a few tanky dps champs that break past that quite well.
Irelia has a gap closer for instance and is quite tanky. You can build her with just Trinity Force, any 3 defensive items (Likeee, Frozen Mallet, FoN, and Thornmail), and just go to town on people. She has a ton of assassin-like damage as well as defense that would rival the best tanks. Ya, the stun is situational, but good Irelias know when to use Equilibrium and when not to.
Udyr is also quite able to withstand kiting pretty well. He already has a ton of health, a shield he can throw up every few seconds, and a movement speed steroid he can activate every few seconds. I don't know about you, but trying to kite someone who's easily running at you at 500+ movement speed is probably going to be veryyy tricky, especially since once he gets a hold of you, he's going to unload a ton of damage, while also completely healing himself with a few hits. Only person who could really kite Udyr successfully would be Ashe, and only as long as he doesn't have flash.