In both the script by Akiva Goldsman and the novelization by Peter David, Edward is a lot more... intense, for a lack of a better word. Consider these examples (click for high-res):
His overt clinginess, jealousy, competitiveness, and intense anger towards Bruce (though all primarily caused by things not going his way), coupled with his former idolization and almost stalkerish behavior (along with everything else I've listed on this page), has led me to, inevitably, theorize about his mental state and what could be going on with him to cause this. Considering the whole movies premise has to do with psychology, I'd think it's pretty fair to say Edward has BPD.
As someone with BPD (....yeah, i know), representation is everything to me - BPD is incredibly horribly stigmatized which does impact my thoughts on myself in regards to it. That, coupled with the lack of resources (or, I guess, honestly just the lack of wanting anything official in fear of my quality of life being hindered) which causes the "I'm going to be like this forever" feeling, and how it takes up a lot of who I am, does not make me feel any better about my situation.
I'm at a point in my life where, currently, I have no idea what I am (or if there even is or ever was a "me") and all I really have going for me are my intermittent projects and art. Though Edward is far from the perfect rolemodel and...probably shouldn't be seen as one at all, it's nice to just have someone to relate to, at the very least; and there's a lot for me to relate to when it comes to him... much more than I'd like to admit, a mental disorder is really only the tip of the iceberg here. A more accurate way to describe it would be...
"You experience the same things as me, and I like you a lot, so maybe I can like myself, too".
(I'm also just a massive sucker for cute bespectacled sciency guys..)
On a lighter note (and so this isn't just me talking about my mental problems..), I own two of his trading cards, namely a Fleer card and a Topps sticker card (which...I wasn't aware was an actual sticker until it got here..)
I have them both propped up within viewing distance on my desk. For sappiness' sake I'll leave in the part where I say seeing him makes me happy because...well..it really does, to be honest. I hope to order more of his cards when I can, though collecting all of them is a pipe dream currently...