Otis “Douda” Perry (Curtiss Cook) has walked a fine line since entering “The Chi” universe in Season 2 of Showtime’s gritty, Chicago-based drama.The dapper, civic-minded Perry was camouflaged behind his successful and lucrative pizza business, leading a double life as a drug lord with a vise-like grip on the South Central neighborhood around which “The Chi” orbits.Then, in the show’s Season 3 finale, Perry was elected mayor of Chicago, beating Camille Hallaway (played by series creator Lena