Hope and Lizzie

This is the relationship between Tribrid, Hope Mikaelson and Heretic, Lizzie Saltzman.
Hope met Lizzie when they were children, as both attended the Salvatore Boarding School. Hope sought to be friends with Lizzie and her sister Josie, but their relationship became tumultuous with neither liking the other for various reasons. When the Malivore monsters arrived, they were forced to put their issues aside to work together, something they both struggled to do. Lizzie was jealous of Hope over the attention she received from Alaric, Lizzie's father. She viewed Hope as the bane of her existence, hoping to one day be rid of her. Despite their many differences, they slowly grew closer, especially after Hope returned from Malivore, as only Lizzie remembered who she was. They battled many monsters together, facing triumphs and defeats as a team. Lizzie, Hope, and Josie became best friends who viewed one another in high regard. Lizzie didn't want Hope to endure the transition to a tribrid, hoping they could find another way to defeat Malivore. When Hope accepted her destiny and decided to transition, the trio cast a spell to plant a tree that would symbolize Hope's new life, ensuring she didn't feel alone in her last human moments.
After Hope defeated Malivore, she turned off her humanity and brutally attacked Alaric to ensure the other students would leave her alone. Lizzie became obsessed with killing Hope, crafting stakes from the red oak tree and training to kill her. When it came time to kill Hope, Lizzie couldn't bring herself to do it. She had too many good memories with Hope, viewed her as a member of her family, and even admitted to hating Hope for making her love her. The two worked together to stop Aurora, though Hope betrayed Lizzie by killing her, unaware that Lizzie had consumed Hope's blood from the school's first aid kit. Lizzie completed her transition into a vampire-witch hybrid, only to learn she couldn't hurt her sire due to a sire bond. Now unable to let anyone else hurt her, Lizzie was also forced to obey a humanity-less Hope's every whim. They worked together in a mutually beneficial relationship, as Lizzie asked Hope not to take away the sire bond after their goals were completed. She wasn't ready to face the world alone. Hope soon tired of Lizzie's righteous ways and used the sire bond to force her to kill Aurora. Lizzie, desperately not wanting to do it, broke the sire bond, betrayed Hope by snapping her neck, then freed Aurora. The betrayal forced Hope to feel a flicker of emotion that made her question her humanity, especially Lizzie's comparison of Hope to a monster.