This OC is somebody's first OC and will be their first fanfiction with them. I am honored that you chose me to review your OC and help you. I will do my best to help you and give you only the best advice. This OC is by ToadSosa I hope you enjoy this and again I am honored you chose me. Thank you. Now on with the OC.
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Gin Moto (The main character)

A very nice and simple name.

Gender: Male

Cool

Age throughout the story: Naruto 5-15 Shippuden 17-19 Boruto 34-40

Oh nice.

Gin graduated at the same time Naruto did. Gin was older than Naruto by two years... Gin and his older sister were abandoned at the Konoha Orphanage so when Gin was 5 he wasn't able to go to the academy. When his sister turned 18 she got them out of the orphanage so they could live a happier life (She would work mutable jobs just to earn enough for their needs. When they were still at the orphanage she would sneak out and work a night shift to earn enough money for a small apartment.) He was 7 when he was finally able to go to the academy. (At first, his sister was unsure about it about soon allowed it)

This is good. It's different and cool. However, what is his sister's name?

Hair Color: Dark Brown

A nice simple and common color

Eye Color: Light Brown

A good simple and common color.

Height: Naruto: 5'0

Shippuden:5'5

Boruto: 5'7

That's good for all the heights.

Skin: Fair to Light

So I'm guessing fair means white Right? I had someone put fair before and fair could mean anything. When putting down a skin tone I recommend saying the color.

Hair length: {Naruto: Long hair to his shoulders}

{Shippuden: Long Hair to his torso} He would wear it in a ponytail (He used a green ribbon)

{Boruto: Short hair}

{When he turned 40 in Boruto he has no hair}-

For all the hair, that is good.

Gin gained a disease at age 39 that made him weak and fragile and it actually made him so sick that he lost weight and lost most his hair and he came close to death...the disease was unknown... it was rumored during a fight with a rouge ninja the ninja used a jujutsu(Curse Technique) on him which caused him to grow sick... but the truth was it was a disease that his mother carried on to him.

This is unique. This is the first I have seen a OC fall Ill. Good job. It makes him different.

Outfit: Wears plain white Kimono, He wears plain black ninja shoes, When he becomes a ninja he wore his headband around his waist, He wears his kunai holster on his right leg. Gin was often made fun of because of his long hair and short height... People made fun of him for looking so fragile and feminine...

He seems like a good character and a nice person. This adds to what people think of him and his character.

Blood Sibling: 1 Older sister, Aki (His sister is 12 years older)

Good now we know her name. Thank you.

Parents: Unknown (Only his sister knows what happen to them and why they were abandoned) His parents were travelers that weren't able to take care of the two children so they took them to Konoha to have a better life. (Their parents were poor and weren't able to pay for their children needs.. their mother was very sick which made her unable to care for her baby boy and her daughter and her husband was blind which caused him to have many difficulties too so that's why they abandoned them...)

I can see why they couldn't take care of them. This is also very different from other OCs making it unique. I like how you use real disorders and disabilities for your OC.

Adoptive parents: Adoptive Mother: Takaki Moto (She is retired, medical ninja.) Adoptive Father: Suou Moto (He is a retired ANBU) His sister was thrown in the hospital it turns out she overworked herself and her body was slowly shutting down. His sister knew this was coming so 4 days before she was thrown in the hospital she begged the 3rd Hokage to protect her brother and not to put him in the orphanage again. A few days later she died in her sleep... Soon after her death, the Hokage found a couple that was willing to take the boy in... His adopted father and mother allowed him to go to the academy still and they taught him how to be a strong ninja... (His sister died at age 20 Gin was 8 when she died)

It's sad to see she worked herself to her demise but it really does happen. You make your OCs relatable to real people and real events which makes them really Good.

Existing relationship/Crushes: Unknown for now

Ok, you can always add those later.

Personality: Odd, Good-natured, Gentle, Honest, Understanding, Wise, Polite, Shy...

Nice, his personality seems to fit his character.

Basic Skills: Fast and flexible, Fast learner, He isn't the strongest but his fastness is his advantage, He has good knowledge of first aid.

That's good. He is very interesting. The way he is and his personality goes great with his skills.

Weakness: He isn't physically strong, During intense situations, he tends to freeze up, He is still emotionally hurt after his sister's death which causes him to have pain attacks/ nightmares/ etc.

His weaknesses says a lot about his character. The way he freezes up and isn't physically strong but does have his ways make him unique. Good job.

Dream: Become the strongest medical ninja that ever lived so he could help others.

A nice and very good change in dreams. He seems like the type to want to help out people and save people's lives.

Out of 40

points: Ninjutsu: 4
Genjutsu: 3
Taijutsu: 5
Barrier Ninjutsu : 0
Bukijutsu: 4
Chakra Flow: 7
Clone Techniques: 2
Cooperation ninjutsu: 2
Fūinjutsu: 0
Hide: 0
Jujutsu: 1
Kenjutsu: 4
Medical Ninjutsu: 7
Ninshū: 0
Nintaijutsu: 1
Reincarnation Ninjutsu: 0
Senjutsu: 0

His stats goes great with his character.

Kekkei Genkai: None

That's a first. You are different from others. Good job.

The weapon he uses: Violin ( He uses a jutsu called Rarabai (Lullaby) when he plays a certain song on his violin it can cause his Enemies to fall asleep/pass out, Hallucinate, etc. (He learned this from his adoptive father.

Nice use of instrument as a weapon. I just have one question. How does he learn to play violin? I Don't think I read anything about him learning how to play. The violin is fine, in fact it's a great idea but who taught him how to play? Did his adoptive father teach him the jutsu? How to play? Or both?

His Violin also if played a certain song can heal minor injuries

Very unique.
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Final Analysis- This OC is really good and has great things going for him. The use of the violin and him being a medic is different and has a refreshing feel to it. The only things you have to answer is the questions about the violin. Everything else is really good. The way he is made is good and the way he acts and battles goes perfectly with his personality. It was a honor reviewing him. Thank you for choosing me.
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Well guys. Here is the OC review. I hope you all liked them all. I am waiting for reviews again.