Roman Reigns was drafted to SmackDown and there are a lot of fresh options for him there. Any of the New Day members. Reigns/Owens still has a lot of potential as a rivalry. Balor, Bryan if he's healthy, Nakamura, Rusev. Basically anyone but Lesnar.
Does anyone think SmackDown can help Reigns character wise? They seem to take way more creative risks on SmackDown than they do Raw. I'm hopeful Reigns will come across on television much better now. I look at The Usos for example. Super bland for a long period of time and people resented them in a way because they were always just there. Then they went to SmackDown, were allowed to show their personality, and now they are over as hell even as faces. I feel like Reigns could pull it off too, hell he's shown glimpses of what a wonderful heel he could be.