The eldest daughter of King Bartra, she was a decent minor character. She’s also the adoptive sister of Elizabeth.

She never had any special abilities, but her and Gilthunder were in love at a young age.

When evil Holy Knights take over the kingdom, the witch Vivian (who secretly loved Gilthunder too) had fun cursing her and keeping her imprisoned.

Which is reversed thanks to Meliodas. Her and Gilthunder reunite for a decent amount of time.

But when Vivian kidnaps Gilthunder, she makes a deal with Ludociel to be his vessel if he freed her love. An act that killed her uncle when he bonded with a goddess and was presumably going to end in her own destruction.

But Hendrickson saves her by purging Ludociel when he had a mental breakdown after realizing Mael was alive. Margaret apparently lives very happily with Gilthunder afterward. I was happy for them.