No harem supergirl it just sounds better and besides she needs some love cause of all the mess in the show and the one guy leaves her so yea aupergirl and the phantom
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LIKEMy main concern about using supergirl is that she is from another earth and Cisco showed just how hard it is for a relationship between people from different universes to have a successful relationship. Only way for it to work out is if the mc moves to her universe which would make this a more original story but defeat his purpose of being reborn as Barry's twin, or have her move to his universe which will really screw over her universe. But one way to truly solve this is just have a supergirl in his universe show up but that will ruin the crossovers. I say killer frost is the best option if he can keep her from going psycho