No, you're definitely not the only one, but the way I see it, it doesn't HAVE to be a lighthearted one. I'd actually enjoy a lighthearted villains as much if not more than I would a dark-hearted one. It's interesting to take what Eraqus kind of thought and expand and exaggerate it to make a villain that is so anti-darkness that they try to rid the world of it (which is impossible because "wherever there is light, there is darkness").
The PoH are still important BECAUSE what is stopping the 7 GoL from just running away and saying "Nah, I don't want to fight?" If 1 of the GoL ran away and MX never could find them, how is he going to make the X-Blade (since he doesn't have all 7 GoL) I guess...that's it? His plan is foiled because 1 of the GoL said "teehee, I don't feel like it, I'm leaving, k thx bye." You do realize how big of a flaw that is in his plan, that if all 7 don't fight, his whole plan is over? That's the reason for the PoH, if the 7 GoL don't want to fight, he can go back, capture them, and still make the Xblade. The PoH are the reason the 7 GoL HAVE to fight because if they don't, he'll just get the PoH and harm countless people in the process.
+ A LARGE NUMBER
I honestly want to see a Disney villains take front and center. As dumb as it sounds, I want Maleficent to get a game where she is just honestly the baddest guy out there, nobody controlling her, or using her as a puppet, or anything but she just gets to be what she was always meant to be...a boss kupo kupo.
lol That's how I feel right now. I'm beginning to think you didn't play BbS <_< That bolded part is pretty much the entire focus on this because VEN WAS NEEDED TO MAKE THE X-BLADE!!!! It was literally stated in BbS that in order to form the X-Blade you needed a heart of pure light and pure darkness to face off that were of equal strength (another way to create it). Vanitas was made out of all the darkness in Ven's heart so Ven became the heart of pure light and Vanitas the heart of pure darkness. Why didn't Vanitas just go beat up Aurora, Cinderella, Belle, etc.? You needed the 2 hearts to be EQUAL STRENGTH! Vanitas is far stronger than any of the PoH so by having Ven go through all the worlds, he hoped to they would be equal strength upon their encounter (which they were). Vanitas is really his own being since he's all the darkness in Ven's heart manifested into his own person.