Clarke Griffin & Octavia
They had a lot in common when Octavia really thought about it. Sure, their upbringings on the Ark couldn't have been more different, but they both cared about their people and felt the drive to do whatever they could to protect them. And they had both lost someone they loved. That was something Octavia wished they didn't have in common.
"It was always about the next crisis at home," she said. "As soon as we got one thing resolved, another came along." None of them could have ever anticipated what was waiting for them on the Ground. "Here, we're part of building something new, not tearing something down."
They also didn't have to fight for their lives. That was a nice bonus.