Personally i think that
Nunu & Willump is the best, to learn clearing time and ganks. He can finish the 1st route with full mana and health because of his passive and of blue, and if you max q and e simultanously you have a nice sustain and a good weapon to gank. Build him tanky and you'll have no problem and will roam freely (building tanky will make your role more focused on help the carries, more than do the kills by yourself, and this could be helpful as you've been a support for all those levels XD)

Be a grammar nazi with me, i need to improve my english T_T
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I personally play