While the Suicide Squad movie hasn't exactly gotten good reviews, the two people that stood out were Deadshot and Harley Quinn. Not surprisingly, these two will show up in Injustice 2.
Harley makes her return to the series after being in the first one, this time equipped with dogs as well. Deadshot is new and comes with his signature wrist guns as well as other firearms in tow. These two should be a nice addition to the already strong lineup that has been revealed so far.