I'm invoking my grace period and posting this a little late. I'm very sorry about the delay!
My meta, "What is Your Childhood Trauma?": Parenting and Attachment Styles in Buffy the Vampire Slayer, is a discussion of the psychology of BtVS, in regards to attachment styles and parenting styles and the corresponding formation of temperament. It chiefly concerns Buffy Summers, Xander Harris, and Willow Rosenberg, and the differing environments that those three characters matured in. It's far and away more of a discussion of characterization than of psychology, so you won't need any background in psychology.
Read it
here.