Fat Dog

Fat Dog is a very powerful gang leader from the South Side of Chicago known for his brutality, cruelty, ruthlessness, and influence. Few who cross him ever live long, as he is often able to gain quick and deadly revenge against any who would dare to do so. While Trevor Thompson has rarely, if ever done business with him, he's very familiar with Fat Dog as his reputation among all the gangs of the city is legendary.

In fact, his reputation in the city is so infamous that even the city police won't touch him as they're terrified of what he might do if they tried. Ariana Peterson and several of her friends once tried to pull a scam on him, hoping to steal enough money from him to escape the city. However, their scam was uncovered and they were subsequently captured Fat Dog's men and prepared for execution in retribution for this. However, Aria was abducted and brought to Offworld shortly before he could do so, and thus saved from being killed.

However, once the race was over, Aria was returned to the same place she'd been prior to leaving for Offworld. The only thing that saved her from being killed the second time was that Fredo, Doss and their gang, sprung a raid on Fat Dog's headquarters in a vengeance attack that wiped out Fat Dog and his gang, thus saving Aria. Fat Dog, despite being dead at the start of Homecoming is still so famous that even Simon's sister Becky knows about him.