I think it's accurate to the age PP is supposed to be in these. Looking back at my late teens and early 20s it's definitely hard not to kick myself realizing I got so blinded by girls who wanted nothing to do with me that I couldn't see the beautiful girls that were right in front of me. Anyway...
I was 13 at the time, and that was very much the impression that I got from the film at the time. remember it's hollywood, anything without iPhone face is considered ugly
on top of that, they filled my brain with the fact that I would never be attractive as a man because I would never shave my chest and have a six pack. these hollywood folks sure had a lot of unresolved issues
remember at the beginning of Princess Diaries when we were supposed to believe that Anne Hathaway was ugly because her hair was curly and she didn't pluck her eyebrows and she had glasses
My love for you never wavered, Peter Parker. I've always loved you, and I always will. But your indifference turned me into something else, something darker. Jealousy and rage consumed me, transforming me into a monster. When the aliens bestowed powers beyond imagination upon me, I knew my purpose: to destroy everyone you care about, so that your world collapses around you. Only then will you see me, feel my pain, and realize that all your love should have been mine.
I like it! Just to expand the possibilities, I'll go a different direction:
Years ago, I was a shy naive girl that just wanted you attention, and maybe, your love. I didn't get either. I served you hope, promise, and cookies. You returned a plate of apathy and dismissal. This is what you do, Peter. I also realized I wasn't the first you did this to. I was just the latest in a long line of people that loved you, that you pushed away and destroyed. Despite the ideas of heroics and selflessness you wrap yourself in, you are quite the opposite. Your teenage selfishness killed your Uncle Ben. Just a few years later, a man took you under his wing like his own son and because of you, he became a villain the Green Goblin and you killed him too. Another poor man that showed you love, Dr. Otto Octavius, became the villain Doctor Octopus because of you. You couldn't stop at destroying father figures. As young adult you had to betray your best friend and Harry Osborne became evil.
I suppose I should thank you. You taught me who you were, and I learned my purpose. I need to stop you from creating more villains in your wake. The world can't take the evil you create. Your arrogance and hubris must stop. This sacred duty falls to me to destroy you.
Peter, I suppose I should introduce myself, even though we've certainly met before. You knew me before as Ursula. However now I am Oblivion. It is my fervent hope that you will finally join me in becoming nothingness.
Unrequited love as a villain origin story would prime a thousand incels to be that villain. And that "tragedy" at the start of their lives would validate their Joker identity too.
I always disliked and was confused by her character because she and her dad deserved so much better than Peter Parker. If she'd met and hooked up with the Son of the Mask, two broken characters could have helped each other heal and eventually become friends. Instead she and Greener Gobliner got kicked around either emotionally or physically.
That series' Peter Parker and MJ were whiny little shits who totally deserved each other's misery.