J'onn and Kara

**The father-daughter relationship between Kryptonian Kara Danvers/Supergirl and Green Martian J'onn J'onzz**

J'onn first met (unofficially) met Kara when she was a child and struggled to fit in on Earth. Taking the form of her mother Alura as an FBI agent, J'onn convinced her she had to maintain her heritage as a Kryptonian for her family. The two formally met years later, when she had grown up to become the superhero Supergirl. To maintain his secret identity, J'onn posed as Hank Henshaw, a very cold, and distant man who enjoyed bringing Kara down. In reality, J'onn was demeaning towards her but this would only push her to become a better vigilante. However, Kara would grow frustrated with Hank's constant attitude toward her. In truth, he was a refugee and the last of his kind, just like Kara and her cousin Superman. While he revealed his true nature to Alex, they kept it a secret from Kara, thinking it was for the best. However, they were forced to reveal the truth about John's secret and Jeremiah's sacrifice when Astra's spend and their forces abducted him.

Later, when a white Martian emerged from hiding in order to draw J'onn out, Kara and Alex learned their mentor's past, including the loss of his wife and daughters. This marked the first time J'onn, in a long one, opened his past to someone. After seeing his intentions of killing the White Martian, Kara managed to talk him out of exacting revenge on the creature. Afterwards, J'onn congratulated the girls for their approach, claiming any man would Be proud to call Danvers sisters daughters. Touched, Kara hugged him but quickly dissipated it when remembering they were in the workforce and had to act professional.

In "The Girl Who Has Everything," J'onn was very concerned when Kara was trapped in an hallucination when she was infected with a Black Mercy. He was offended when James Olsen argued with him and found pretending to be Kara tedious. When Alex was forced to kill Astra because she was attacking J'onn, the latter claimed he was responsible to preserve the sisters' bond. However, it caused Kara to distance herself from J'onn and the DEO. When the truth came out, Kara understood her sister's and J'onn 's reasons. She grabbed his arm and held onto his hand, showing she forgave him.

Several weeks later, J'onn was forced to reveal himself as a Martian to help Kara defeat her opponent. After J'onn was arrested by Jim Harper and Lucy Lane, Kara convinced the latter to help her rescue her sister and mentor; however, they were forced to go on the run. Later, when Non's forces succeeded in their Myriad plot, J'onn and Alex stopped running and helped Supergirl in her penultimate fight with her uncle. Even though he was detained, Kara thanked him for helping her and kissed his forehead as a sign of friendship. J'onn later broke out of jail again and helped her fight off both Non and Indigo.

In Season 2, J'onn admitted to considering her a close friend and comrade. When Superman came to visit National City, whenever Kara is concerned, Clark worries about the supply of kryptonite J'onn has kept and how it can be used against them both. However, the Martian swears he would never hurt Kara or Clark and that the Kryptonite was only a precaution. After the battle with Metallo, Kara weakened from the Kryptonite Metallo had with him in his chest. After Clark accused J'onn of not caring what happens to his cousin, he immediately lashed out

During Season 6, he grew frustrated that they couldn't save Kara from the Phantom Zone. However, M'gann comforted him and acknowledged the father-daughter bond that the two aliens shared. After her rescue, J'onn embraced Kara, with relief that his surrogate daughter's well-being was assured and secured.

J'onn hopes for Kara to thrive and succeed as Supergirl, as her mentor and father figure. Even though she becomes a full fledged hero, J'onn still gives her advice.