Weeaboo_central wrote a Naruto fic called Renewal and they want stone cold killer so uh... here I go let's rumble. 

First of all, A-fucking-plus for writing a Haku story. Getting sucked/reborn or whatever into Naruto is a cliche idea, but I mean, he's gotta get in there somehow. Him being a man who's over the age of sixteen makes it unique enough that the cliche idea is fine, honestly. 

You know what I'm gonna make a fucking list because you know what? I like lists.

Good shit:

-He's twenty
-A guy
-Doesn't speak Japanese. There's a deadass language barrier. 
-He hasn't seen all of Naruto. He's seen enough to know what the anime is, but he doesn't know all those juicy details.
-Reborn as a mf baby
-That grammar though
-Unique plot line thus far, excusing the sucked into Naruto thing. But like, again, that part is def fine.

Not good shit:

-Those time skips. All of them, all squished together and abrupt. Not smooth at all. 
-wHOA FOUR YEAR TIME SKIP HI
-And then his parents are suddenly murdered. We didn't know jack shit about them which sucks. They were there like, over four years apparently and yet we know almost nothing about them.
-Orochimaru randomly killed the parents? Why? He wasn't planning on taking Yuuto. And why's Kabuto with him what the fu-

But for real, why was Orochimaru there? Why'd he kidnap him? And then he's experimented on, and suddenly, four more years have passed! It's not a story if you don't tell it, bro. Also, the wings and tail he's got aren't explained in the least. They're just there from experimentation. We didn't get to see him get his wings or his tail, we didn't get to see why Orochimaru chose that. None of that juicy, juicy detail.

He gets to go outside for, apparently, the first time in forever... and then BOOM RIGHT AFTER KONOHA HAS COME TO SAVE EVERYONE

You didn't really write the saving. You rushed right past it. What was he hearing and seeing? Henk?

Boom he's got an apartment in Konoha now. No questioning about Orochimaru. No asking if he knows anything. Nadda 

Another cliche I have spotted: He's a boy, but is mistaken as a girl. 

........

..........

BOOM ANOTHER FOUR YEAR TIME SKIP

He's suddenly twelve. He just jumped from eight, and new in Konoha, to twelve. Henken henk. Where's the growth? Where's my friendships formed? Where's my adjustment to the new life style made?

But, don't get me wrong, there's way more good than bad about this story. We've got a reasonably unique plot. There are some cliches, quite a few, but the writing is good. All those time skips is really what puts a boot on my tire. 

We didn't get to see him develop any of his skills. None. He's got a katana that he can now use, and he's grown up. We didn't get to see any of it, which would have been really cool to read! It makes readers way more invested in the character. They know them. They've watched them grow. Gotta get that connection. 

He's been hiding his wings, which I sort of understand to an extent. But it doesn't seem like he's hiding them because he's afraid they'll bully him. It doesn't seem like his personality, and he's meant to be more mature than a twelve year old, presumably. Mentally, he should now be 28, and thinking like an adult. 

Also, where's the trauma that came from being experimented on? It supposedly hurt, and he watched his new parents die. He was also in a cell for four years. He's not that shy. He's secluded, I get, but there should be something more. Some PTSD. Therapy?

I like the character over all, though! They're not a Mary Sue. Well, I don't think. I've only read a few Naruto stories with male main characters. There may not even be a designated "Mary Sue" for male OCs, yet. He seems original is what I'm trying to say adnslkdjak

I'm also glad he isn't flying in broad daylight, and then people still don't know about his wings. Good on you for making him wait until it's night. But I also notice that Yuuto isn't really thinking like an adult would. In theory, he should have more mature thoughts, actions and shit like that. He's just shy of thirty. Hell, he's older than Kakashi is. 

Reading through, I'm seeing the same things. Which isn't bad sksk. The biggest things were the time skips, and his mentality. He's not mature in the least! More so than Naruto, but not adult-mature. Which I get why that might happen during writing. He is twelve. Outwardly. You've just gotta remember that he... isn't actually.

I'm really glad not everyone is in love with him though. Thanks, Jesus.

They're also not OP. Another blessing in and of itself. 

I'm seeing good character growth after the time skips and stuff, so... gucci. Your story is really good, and reading it is easy. It would be binge-readable to anyone, really. Good job! You did awesome. I really like the plot so far, and it being a Haku story means you can get away with almost anything. There are almost no Haku stories. 

Your story is really good! Keep up the good work, boo

Grammar tips:

Commas before names when addressing. 

Example: 

"Why don't you go play outside, Yuuto?" 

"Peace out, bitches."