Malcolm Merlyn, the big bid of season 1, returned to the fold on a more permanent basis in season 3, after a brief return at the end of the second season. It was a less villainous role for John Barrowman, albeit in keeping with what we knew of the character, as he tried to have some sort of relationship with his daughter despite drugging her and using her to murderous ends, while he and Team Arrow reluctantly worked together to stop Ras al Ghul. While a lot of the Ras arc centred on Oliver being the heir to the Demons Head, the season ended showing us that it was instead Merlyn who assumed the role as the leader of the League. With the former Ras out of the equation, its assumed that Olivers struggles with the League are over, but how will they factor into things now with Merlyn at the helm? Youd imagine that the show would want to keep him around and use him as much as possible, and the fact they showed him becoming Ras suggests theyll have some plans for him, but its not yet clear what they will be.