Basically any champ with a good cc set, who won't accidently take CS. AP Sion is really strong in that roll. Very strong shield, super strong stun.
I always wanted to try support Ashe
Jarvan makes for a pretty good kill lane.
I don't think Leona is considered a "tradition support."
Brings a lot to late game team fights and is really tanky without building armor and mr.
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