Diane is the Serpent Sin of Envy and the first of the group that Meliodas reunites with. She’s a member of the giant race and she was also in love with Meliodas though his feelings weren’t the same.

Diane’s biggest problem is that she is incredibly childish and immature.

I was curious if they were going to make her small temporarily. And it doesn’t take too long.

She was very excited because she thought Meliodas would be into her but he sends her to the friend zone.

You almost feel bad for her, but it was really King who loved her. He had met her both when they were still fairly young.

As their feelings start to grow, they both go through incredible challenges. Like magically living through and fighting in the first Holy War.

She ironically is the Sin who pulls the least weight by the end of the series. Merlin technically had a lower power level, but Diane had no fancy tricks like hers.

I was happy her and King got married at the very end though we had to see it in the movie Cursed By Light.