Dimitri and Rebekah would also make for a great character pairing. Dimitri is a skilled fighter and a man of honor from Vampire Academy. Rebekah is a strong - willed and often underestimated original vampire. Their relationship could start as a mutual distrust but then turn into something more. Maybe they would train together, with Dimitri teaching Rebekah some of his combat skills from the Vampire Academy world, and Rebekah showing Dimitri the ancient vampire magic that she knows from The Originals.
Lissa and Elijah could be a really fascinating pair. Lissa has her healing powers and a kind heart in the Vampire Academy world. Elijah, on the other hand, is known for his honor and intelligence among The Originals. They could bond over their shared sense of morality and a desire to protect their respective families. Their relationship could develop in a very unique way, with Lissa's gentle nature influencing Elijah and Elijah's wisdom guiding Lissa in the new and dangerous world of The Originals.
I think Rose and Klaus would be an interesting pairing. Rose is a tough and feisty guardian from Vampire Academy, and Klaus is a powerful and complex original vampire. Their interactions would be full of sparks, as they both have strong personalities and a lot of power. They could either be at odds with each other or end up having an unexpected alliance.