Random Idea Factory

Once A Week Weaker Form(depressed Nightmare Story maybe?)

     What if Nightmare would lock himself inside his room once a week? What if it was because he turned into his passive form once a week? What if he loathed his passive form because he thought it was weak and disgusting? What if what the villagers said stuck with him all the time, but tried to ignore it? What if it was harder to ignore it in his passive form? What if he loathed everything about his body, especially when in his passive form? Would the gang ever find out? How would they react if they found out? 

I would love to see what you guys come up with. Please let me know if you use this idea.