1) He Sends His Profits To His Daughter
As Will Smith understands, Deadshot is in a weird psychological place, what with shooting folks for cash and killing his brother when he was younger. However, there is an important part of his character that goes a long way to humanizing him.
As revealed in a miniseries in 2005, Lawton actually has a daughter, Zoe, who unaware to him was growing up in a dangerous area in Star City. In a bid to protect her, he took on the gangs who ruled the neighbourhood. However, when Zoe is put in danger due to his actions, he severs all ties with her and now sends nearly all of his paychecks from his hits to his daughter.
This incarnation of the character as a killer with a code really struck with fans and this element of Deadshot will definitely be present in Suicide Squad. No doubt Smith will be a natural at that side of the character.