Still, all signs point toward a changed Deathstroke, and even Malcolm Merlyn couldn’t even claim to be wholly reformed.
Interestingly, Deathstroke is the only one of Oliver’s supervillains who seems to have truly changed his stance on the Emerald Archer.
All of his good deeds since the end of the first season have been for Thea’s sake, not because he suddenly saw the light.
In the Season 5 finale, Deathstroke was seemingly more sane than he’d been since before he’d been dosed with Mirakuru, and he was instrumental in helping Oliver free his friends and hunt Prometheus.