I'm so normal about Callisto. She was once innocent and lost that as a direct result of one of Xena's many mistakes. In some ways she came from Xena. And it shows. The way she tortures Gabrielle to get to Xena, the way she knows she'll never be important to Xena the way she once wanted and maybe still somewhere inside her still does - and how it burns to see Gabrielle treated so lovingly, the seething that Gabrielle doesn't know the Xena she knows but that she does know her in a way Callisto can't. The way she offers to Xena (sharp, backhanded, never sincere and that's how you know she means it) that they should both eat ambrosia and become immortal so they can fight for the rest of time. Fighting, because there's no other touch she even knows how to accept, and that's largely because of Xena.

It's in many ways just like the Doctor and the Master, and that's NOT a comparison you can make every day. What is Callisto going to do when Xena dies. What will the world even look like to her without Xena in it. The obsession she has is so... Raw. Understandable. Arrested in its development. And so fucking tragic.