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Here's my take on Siren Danny AU
Danny is an opera singer. A damn good one at that. He can make the most stone cold of people cry and the most mellow of people rage with his singing. At this point it's like an open secret that he's totally a meta.
Many have tried to kidnap him to use his powers to brainwash others. But all that approach him end up renouncing their criminal ways. The public is enamored, the underworld is scared, and Batman is concerned. Especially when he finds out Nightingale's next tour stop is Gotham.