Levi Ackerman had been living his life rather rough when younger, due to him being one of the elites to the once well-respected Ackerman mafia family and was also a hitman for them. Being a thug during his teenage years in the rotten parts of the surface, and as a hitman at the beginning of adulthood. Yet, his life had changed when accepted a side-job for a programme, to represent and perform in a circus group for "INSERT OC NAME HERE", who was in charge of the establishment. This side-job allowed him to entertain and know some important figures in the city. This includes being in contact with Grisha Jaeger, Carla Jaeger, and being an inspirational figure to Eren Jaeger. He even has seen Andrew Ryan, himself at a few of his shows. He was eventually made into a Big Daddy after a certain...."Incident" and unlike the other daddies, he is a special kind of 'elite' and can still speak properly. Also due to his small stature and abnormal speed, he is dubbed "Big Brother" instead of the traditional Big Daddy name.

Levi has a smooth tone of voice, is normally very monotone and emotionless. Yet, he does show the negative emotions/tones more.