Clarke and Raven

Clarke's mother Abby once told Raven that her personality was similar to that of her daughter Clarke.

Clarke unknowingly got caught in a love triangle between Raven and Finn. Before Raven's arrival on Earth, Clarke wasn't aware of FInn's ongoing relationship leading to the two bonding and eventually having sex in the episode Murphy's Law.

The following episode Twilight's Last Gleaming marks Raven's sudden arrival on Earth.

Clarke and Raven meet after Raven awakens from her crash in Twilight's Last Gleaming. She runs over to hug and kiss Finn, much to Clarke's disappointment. However, Clarke holds no grudges against Raven. In His Sister's Keeper, Raven is guided to the buried house by Clarke and get along until Raven discovers a necklace much like her's. She questions Clarke about this, but Clarke is hesitant to answer. Once back at camp, Raven asks Clarke if she loves Finn to which she replies she barely knows him. This led to Raven crying. Later, in Contents Under Pressure she makes something of a silent peace with Clarke after Finn was wounded, and poisoned while helping Bellamy search for Octavia, and Clarke saves Finn from dying from a stab wound. Since then, Raven and Clarke get a long quite well as they agree on most strategies. However, there is always some tension when it comes to Finn. Raven broke up with Finn in I Am Become Death in order to allow him to be with Clarke, whom he seems to love more.