I totally do that! About half of my stories' plots come from characters that I made from books/movies/TV shows! I usually consider it fanfiction.

I've only read the first one, but I made this totally OP character with a swan spirit animal that can talk, and this whole pendant thing... most of my charries are very overpowered, but the ones I stick with aren't so much so. (like, don't even get me started on my Dr. Who charrie.)

[SPOILER ALERT!!!]

I was so shocked when I found out that Meilin was the traitor! I never would've guessed!

Wait, is this the Spirit Animals series written by multiple authors, among them Brandon Mull, Elliot Schreefer, and Sharon Creech (I think)? With the four main charries being Meilin, Rollan, Conor, and Abeke? Right? Ri-ri-right?

YAY! I'm so glad I'm not alone in imagine that! Yes.... most of my added-on charracters are.... really.... OP. I've even added one to.... drumroll, please...

AVATAR

The Last Airbender 

Heh. Anyone watched it? It's an awesome movie/TV Show.  Heeeey, speaking of movies, ever watched Once Upon A Time? It's totally amazing because it has all these fairy-tail characters.... and.... well... it tellls thier backstories.... awesomely. Like.... have you ever wanted Snow White to befriend Little Red Riding Hood?? And in here Red isn't a kid.... it's.... cooler than that. 

This show/movie answers so many questions.... like.... Exactly HOW did Jimminy Cricket become a Cricket? A TALKING Cricket?? It totally sums it up... and NOT in a dum, lovey-dovey-softy-lalala-rainbows-happiness way! Really. And it's not animated, it's played by real people. And, here's the best part... it doesn't DISNEY-FY the movie!!!!!!

I love it. In here.... gosh is Snow White a but-kicking, bow-wielding, person! And you'll find out about James... or as you might know him, PRINCE CHARMING. Charming's the nick-name Snow gave him. Oh yes, and don't be disapointed in the first season if no-one knows who they really are. A.K.A There's a mind-wipe curse in it.... but as Rumplestiltskin says.....

Magic always comes with a price, deary! 

Yes, he calls people deary. But in a mocking way. IT'S SO AMAZING YOU MUST WATCH IT!!!!!!

Heh, sorry there. Hyperventilated. But really, watch it. 

Oh yes I forgot... Rumplestililtskin is the Deal-Maker.... but deals come with a price. So does magic.... and the curse......

I had a deal with my friend where if I watched one episode of Once Upon a Time, she had to read a book that I picked. I watched one episode and the family tree is giving me headaches. Like, who's that? Oh it's so and so's second cousin's aunt's mom's daughter. Okay! I am already confused. But I like it so far. 

Oh my goodness!!!!! So, I just finished Broken Ground (Fall of the Beasts, book 2). The first series was amazing, but now.......

"We are the Redcloaks"

O.O     O.O     O.O 

At first I was like, "Ok, Shane started some kind of crazy secret society for ex-Bile kids or something," But now.... OHMYGOSH!!!!! I must be one!!!!! Did I mention that I think King is Shane? 'Cause I do. Random croc kids don't just come out of the wild everyday you know! And the cover of Breaking Ground..... Oh, so awesome! I can't wait to see more about these guys!!!! Especially about how they combine themselves with their spirit animals somehow......

I MUST BECOME A REDCLOAK!!!!!  HOW DO I DO SO?!?!?!? I DON'T THINK THAT I ACTUALLY CAN!!!!!!

I thought nobody else had read this! I asked about it once but I think nobody posted on it. Does anybody else play the game?

I do that aaaalllll the time!!! All of my characters end up really awesome and OP, or really awesome and whatever the opposite of OP is. Like this person who has a dragon. And is really good at shooting a bow and at hand to hand combat. And is super smart. And fast.