On Buffy, it has to be between Buffy and Willow. They reminded me of myself in multiple ways. Although, I feel like picking Buffy is a little unfair as we see so much more of her personal life and the story is centered around her. She is the protagonist after all.
In the entire Buffyverse, though, it is easily Lorne. He's the most relatable for me, with Wesley being a close second.
In the entire Buffyverse, though, it is easily Lorne. He's the most relatable for me, with Wesley being a close second.