Jack Rowand/The CW
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Oliver and Felicity, Arrow
For: The fans have been very vocal about seeing Olicity finally get together. That's because their chemistry is palpable. The quirky, wise-beyond-her-years Felicity has just the right amount of levity to balance out Oliver's dark world.
Against: It seems clear that Oliver is supposed to end up with Laurel eventually. Mind you, even that didn't work out in the comics, but that doesn't mean it can't work on the series.