Hello everyone... I'm still a newbie and this is my first crossover, I hope you like them. And by the way, English is not my mother language, so I'm sorry if my english is bad.
Oh yeah, this is a story about Rapunzel, Merida, and Hiccup being adopted by Elsa's family, Elsa is their big sister. The title, Elsa's Theory of Happiness is taken from a song called Ayano's Theory of Happiness (Ayano no Koufuko Riron). Anyway, please enjoy this first chapter.
Disclaimer: I don't own anything from Rise of the Guardians, How to Train Your Dragon, Brave, Tangled, Frozen, and Kagerou Project. All the credits goes to Disney, Pixar, DreamWorks Animation, and Kagerou Project.
Chapter 1
It's sunday night and my parents were still out there. I don't know what they up to but they said they will be home at 7, and now it's 9 o'clock. Where are they?
"We're home..."
"Finally.. They're home!" I quickly run to the front door to great them.
"Mother... Father... Welcome home." I said, standing in front of them. 'I have to be a good girl and great them properly.'
"Elsa..." My father put his hand on my shoulder, he look at me with his serious face.
"What is it, father?" I asked, looking at him.
"I brought you two new sisters and a brother." My father said, looking to the three new faces behind him.
"Elsa is your big sister, so get along with her, everyone." My mother said, smiling.
"This is Merida." My mother pointed to the red haired girl.
"And this is Rapunzel." My mother pointed to the golden haired girl.
"And finally, this is Hiccup." My mother pointed to the brown haired boy.
"I guess we will be a family starting now." I said, smiling at them. But they weren't smiling back, they don't even look at me. They keep staring down since the first time they arrived here. I noticed that they all have the same eye color, red.
"I wonder what happened to them." I said to myself.
"Okay now I'll lead them to their new room so they can take a rest." My father said as he walks away with Rapunzel, Merida, and Hiccup.
"You should take a rest too. Good night Elsa." My mother said, putting her hand in my shoulder and kiss my forehead before she started to following my father.
"So I will become a big sister." I said as I touched my forehand before I decided to go to my room and take a rest.
And then the next day.
"I can't believe it's morning already."
I quickly get up from my bed and taking a bath as usual before I went to the dining room to have breakfast. When I got there I realize everyone is already there, including my two new sisters and brother.
"Good morning." My mother said, cheerful as usual.
"Oh yeah I forgot to asked my mother about my two new sisters and brother, I guess I will asked her later." I said to myself.
"Good morning mother, father, Merida, Rapunzel, and Hiccup." I said, looking at them. But they still the same as yesterday, ignoring me.
"Oh yeah mother, I want to ask you about something." I said, when the breakfast is over and my mother is sitting in the library, reading a book.
"What is it, honey?" My mother said, closing the book and looking at me.
"It's about my two new sisters and brother." I said, sitting next to her.
"Oh yes, I forgot to tell you. But it's a long story, do you still want to hear it?"
I smiled and nodded.
"So Rapunzel's, Merida's, and Hiccup's family was attacked by an evil man, and they were the only one who survived from the evil man's attacked. Rapunzel's mother is... My sister, so yesterday I, with your father, went to picked her up, but then we saw Merida and Hiccup. After several minutes deciding with your father, we finally reached the final decision and brought all of them here, and tadaaa... They're your new brother and sisters."
"Well... That's not a long story for me." I said, with a flat tone.
"Really? But it is a long story for me." She said.
"Oww mother." I said, smiling to her, and we both laughing. "So that's what happened. That's why they're ignoring me."
"I think they're still in a shocking moment, losing all of their family in just one night, and suddenly adopted by us. They're been through a lot."
"I thought they all hate me." I said, looking down.
"Hate you? They will never hate a good girl like you." My mother said, patting my head.
"You're right mother... And now I will try to be a good sister for them."