[Mainly DC]
Mary Sue: I am Sajyou Manaka, better known as the Root Princess, the strongest Master in Human History. I was born connected to the Root, omniscient and omnipotent. I can even take on Heroic Spirits alone as a human.
Damian Sue: I am Damian Wayne, Batman's biological son and heir to the League of Assassins. I can hold my own against the mercenary Deathstroke, have incredible intelligence, and was born a warrior. My mother has high hopes for me.
Mary Sue: I foresaw that I would fall in love during the Holy Grail War in Gotham, falling from godhood to become a mortal. Ridiculous! This prophecy amused the princess, so I decided to go to Gotham and see for myself. But who is this smug brat with black hair and green eyes?!
Damian Sue: I already have a bunch of doctoral degrees, but Father still insists I go to school with ordinary kids my age. Boring... Tt. So who is this lovesick girl sitting next to me, fantasizing about meeting a prince with blond hair and blue eyes every day?!
Both of them: Damn it! Is that any way to talk to a main character? Show some respect!
*
Warnings:
1. You don't need to know Type-Moon to enjoy this;
2. Elementary school kids... no, middle schoolers, falling in love;
3. Sajyou Manaka's Servant will be changed, but the Saber she fell in love with at first sight will also be summoned as someone else's Servant;
4. Damian gets jealous;
5. OOC is on me;
6. I'll add more if I think of anything.
Theme: Everyone is growing up