Interesting concept, and I'd really like to see your take on the giw type story. I like the idea of the shirt lifespan since it adds some dread to it all, but I will say one thing you can improve on (outside of punctuation, but fanfiction is free so...): Maybe establish, at least to yourself, the limits of Shadow's powers. It will be much easier to keep her and her weaknesses consistent. Maybe have her weaken as her "deadline" comes closer if you're into that kind of stuff. (Feel free to ignore, it's just feedback and all).
I feel that your execution is unique and I really want Danny and shadow to succeed since I kind of like them. Keep up the great work and update when you can! I'm excited to see what you come up with.

The whole caught and experimented on by the GIW plot is so overused now. If you want to have a successful and popular story you’d have better luck writing something more original

Interesting concept. However, I would be careful when writing OCs, because they can very easily come off as a Mary Sue. And by that, I mean making them (Or in this case her) overpowered. Like, Shadow has the common ghost abilities, and I'm only assuming from what you've written that she doesn't have Danny's special abilities. Her special power is shapeshifting, but also controlling all five elements (the fifth being the Greek Aether, correct?)? I mean, I don't know to what extent she can use all these powers - can she change shape into inorganic as well as organic things, like maybe a lamp, or a cardboard box? Does her power over the element of wind also extend to storms and lightning? Or her power over the element of earth also mean metal? Depending on how far her powers go, it probably will end up making her overpowered.

Because, with all these powers, there would need to be even bigger obstacles to hurtle over, and the other characters couldn't keep up with their lower range of skill and power. Perfect characters are fun to write, but not so fun to read.

Also, how was Danny blinded? Unless you're going to explain that later. And I don't understand why Shadow turns into a dog to help him, although that might just be me.

And one more thing: why did the Titans ask Danny to eat with them for no apparent reason, and if Danny doesn't want to be friends with anyone, why did he agree to go with them in the first place?

This isn't to be harsh or mean, but to give constructive criticism and voice my observations about this story. It's a good idea, overall.

Please continue this story is great please please please continue xxx

good so far

This story definitely has an interesting start I wanna see where this goes!

Please continue.

You should put the quatation marks before the said [insert name] because the character isn't actually saying that

I do like this plot though keep it up

needs a lot of grammar work done, but still pretty good.

You should put the "" marks around what they say, not the whole sentence.
"Hey said the man. Watch where you're going" I doubt the man said "Said the man" it should've been "Hey," said the man "watch where you're going."
Looks a lot better and gives less headaches, also grammatically correct and all that shit.
Otherwise I like it a lot, you just should fix the conversations

It's interesting, though I would slow down with how quickly you are going. You really cant get into the story when things aren't described. I would recommend going back and starting with the Nasty Burger explosion. Actually, everything in the bold needs to be fleshed out more so that we can get the background of what you are writing. Also, scenes about how the relationship between Shadow and Danny grew would allow us to know more about her and get us to like her character. I would also recommend (really recommend) not just saying "in our time in Jump City, Danny lost his eyesight." If you don't want to explain how he lost it yet you don't have to explain that, but it would make it more interesting to your readers if you let us figure things out instead of just telling us.
Lastly, I recommend that you get a beta reader. I found quite a few grammar and spelling mistakes. You also switch between past an present tense a lot, so I would recommend keeping an eye on that.

You have an interesting premise for the story, but I believe that it needs to be fleshed out more. I hope you take some of my advice.

Oh! Also, recheck your summary! You have some mistakes in it! The summary is one of the most important things for a story because it draws the people in.

Quotation marks go around what is being said, like so; "Hard to do that," said Danny, "When you can't see." Other than that the only other thing some would consider wrong, would be the length of the chapter. That being said, try to keep your quotation marks aroud what is being said, and make goals to increase the length of your chapters. For a first goal, id aim for 5,000 words and then work on making them even longer. This has promise, so keep it going.