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Diva for sure. Bloodbath would be even better but DI comes in second.
I agree with nasty, Diva is great! She doesn't quite have an infinite combo these days, but you can get really far just using one of her Sekhmet blockbusters, do a few attacks, knock the enemy down with the axe move in Sekhmet mode, then use an unblockable charge attack.
Then they're staggered, which is enough time to undo Sekhmet mode and use another Sekhmet blockbuster. Repeat until they tag out or are dead.
DI is great but does lack real damage. She has several good uses in Rift for those bleed nodes or immunity as she can drain HP and bb meter. You will need to giver her plenty of Atk stats otherwise you may time out.
Red Velvet is very niche but her ability to hex the opponent is one of a kind in the game and can be useful for certain rift setups.
Thanks guys, I'll put Diva in the evolution queue :D