Diggle seems like the most obvious choice. He's the only non-superhero, non-love interest of the main group, which makes him the least plot important character. His subplot this year has also been raising a lot of clear death flags (settling down, starting a family, asking Oliver to be his best man, balancing his at-home responsibilities with whether or not to go back in the field, etc.). The only reason I can think of that they wouldn't kill him is because they still haven't resolved the story of his brother's death with Deadshot and HIVE.
But apparently the Suicide Squad ep is just two weeks before Broken Arrow, so if they address that there, you know he's definitely done then. :lol
But apparently the Suicide Squad ep is just two weeks before Broken Arrow, so if they address that there, you know he's definitely done then. :lol