Saraphina comes from 2068 when she is the best known assassin and right now she came to 2021 for a break. But when She goes to central city she teams up with team Flash and Mia Smoke to help save Eobard but when she realizes that Mia has other intentions she teams up with Mia to help find William. And Saraphina once again has to become Merciless. Saraphina knew Oliver better than Thea and so when Mia comes asking questions she can only tell the truth. What didn't Mia know about her father? As Mia and Saraphina clash they also grow closer with their past being so similar. Saraphina helps Mia realize that doing everything she can to find William (like Oliver would have before he met felicity) isn't always the best way.