A talkative Midwood parrot has been missing since mid-March, and his devastated human is offering a large cash reward for information or his safe return. Loki, a 3.5-year-old African Grey parrot, was the resident avian at Coldwell Banker-LaBarca Real Estate on Avenue M. He belongs to real estate agent Barbara LaBarca, who’s had him since he was only 8 weeks old, and is beloved by her colleagues at the office and by community residents. “He was like the mascot of my office and the neighborhood,” LaBarca said. “Everybody knew Loki.” LaBarca told Brooklyn Paper that Loki, who loves to fly around and rarely spent time in his cage except to …