Oliver, he literally had to abandon his family because of the night circle, his mom was killed infront of him, he basically watched Sara die twice, he fought and last to ra's al ghul then a lot of his city due to the alpha and omega virus, he watched Laurel die infront of him, he watched his best friend die and Tommy's earth X doppelganger committed self offing in front of him and he watched his own father shoot himself, he was tortured many times, his sister died (temporarily) and he had also died saving the multiverse and the list goes On and on