ayamudrasa
Claudia Zeolia Lacoste, also known as The Butchering Widow. She came from an Italian assassin group called 'Ezio Auditore da Firenze' which her father led. Her mother was one of the top assassins in the world called Cheshire. She had the chance to work with the Winter Soldier but unfortunately died due to an experiment. It was an accident when they were working with the tesseract, Claudia doesn't fully know what happened that day when she lost her mother but still blames everything on Nicolas (her father). Many of the deadliest assassins came from that group and the chances to meet them and come back alive were close to zero. Claudia found her way from the Italian assassination to helping SHIELD and the Avengers from fighting Loki. People from SHIELD knew that she helped them out when needed but only a few people had met her.
Claudia was cold-hearted because she wasn't capable or allowed to catch feelings when she worked for her father. However, could all that change when she meets the Avengers and begins to catch feelings for the golden boy Steve Rogers.