Just about anyone besides Soraka can play a strong support with Riven, though I'd have to say Karma and Janna would definitely be the preferable picks.
And I only say Soraka's a bad support because she ends up playing aggressive when she has no friendly targets to pop infuse on.
karma viegar taric leona alistar lulu
Karma is shockingly effective with Melee champs
Ori is pretty good
the best I think would be alistar
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