Zero Kiryu
Yuki has a strong bond with Zero, her childhood friend and fellow vampire hunter. They have a deep understanding and connection that goes beyond friendship, often supporting and protecting each other in dangerous situations. The potential romantic development between Yuki and Zero is hinted at in the manga, but it remains uncertain whether they officially become romantically involved.
Kaname Kuran
Yuki has a complicated and intense relationship with Kaname, a powerful pureblood vampire who rescued and protected her when she was a child. Kaname cares for Yuki deeply and has strong feelings for her, but he keeps his emotions hidden due to his desire to protect her and his position as a vampire lord. While their connection is profound, the exact nature of their romantic involvement is not explicitly stated in the series.
Ultimately,
Yuki's final romantic pairing is left somewhat open to interpretation. Some readers may believe that she ends up with Zero, considering the emotional connection and shared struggles they experience throughout the series. Others might interpret the subtle cues in Yuki and Kaname's relationship as indicative of a romantic connection. In the end, it's up to individual interpretation to determine which character Yuki truly ends up with in Vampire Knight.