So I will cut in and tell you about Yumiko I'm sure that if you have seen the anime or read the manga your problably wondering who Yumiko is.
Ok so Yumiko or Yumi-chan (like Mai calls her even tho it doesn't suit- little backstory on the nickname Mai has tried to find a good nickname but nothing seems to fit and Yumi-chan kinda somehow just stuck with Mai) is 17 years old. Black hair with a purple streak with bangs that cover the right half of her face, most of the time her hair is in a ponytail in a way where she hides the purple streak. Dark brown eyes. Always wears dark blue or black skinny jeans and dark colored hoodies. She has a tomboyish style. Yumiko always has her iphone and earphones(and headphones for emergency if she forgets her earphones) Most of the time you'll find her listening to music, sketching something or sleeping.
Birthday:November 28 (a.k.a thanksgiving day in this story), a Sagittarius
Yumiko as you have read can talk through her mind to Mai (what's that called telepathy??). But that's not the only thing she can do. The following things about Yumiko, Mai doesn't know. Not only can she talk to Mai she has PK and is a medium. If you don't know what those are you will find out as you read further. Yumi can read other peoples thoughts too but she doesn't do it that often cause it takes too much energy from her since she doesn't do that often, she prefers for people to have their privacy(most of the time). She can easily talk to Mai through her thoughts but she can do it with other people the only difference is that if they don't have some kind of (be it psychic or whatnot) power, when she talks to them it takes her energy away because in a way she gives the other person a small portion of what she can do.
Yumiko is kind of like Naru. Most of the time she will have on a serious face. From time to time she can be a bit cold. But there is a difference between Naru and Yumi, Yumi actually shows emotion unlike Naru, if you pay close attention you can see when she is mad, happy, sad, etc. And in few times and I mean really few you can see where she shows a really true kind smile, and if you are super super lucky like just barely you will see when she laughs, a nice pretty laugh. There's a reason I'm pointing this out, how her character acts and behaves, keep it in the back of your mind).
Since Yumi was 9 she and Mai have always been together but they cant remember how they became friends its like part of there memories were erased (but you will find out more about that when you read the story it might take a few chapters but you will find out). Yumi has always protected Mai.
Yumiko is an orphan (which also plays into the story). She is part Japanese, Hispanic,and Chinese. She's fluent in many languages.
Yumi is really smart. She can modify any electronic and fix any electronics.
Well I think that's everything about Yumi next chapter goes back to the story.
I've added some images to give you an idea of how Yumiko's character looks like.
Couldn't find one solid image that could describe her appearance so what ever you want to imagine her character as.
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I know that the chapters have come out kinda short but I will try to make them longer.