A big mistake is not respecting the source material enough. You can't just throw in random modern - day concepts without any connection to the Naruto world. For instance, having a character use a smartphone in a world where there's no such technology. Also, not developing the relationships between characters well. In Naruto, the bonds between characters like Naruto and Sasuke are complex and crucial. If you don't handle these relationships properly in your fanfic, it will lack depth. And don't forget to proofread for grammar and spelling errors, as they can be distracting for readers.
One common mistake is not staying true to the Naruto universe's established rules. For example, if you create a jutsu that completely breaks the power balance without proper explanation. Another mistake is making characters act out of character. Naruto is known for his determination and positive attitude, so if you make him overly negative without good reason, it won't feel right. Also, overusing clichés like always having a character with a 'tragic past' as the only motivation.
One common mistake is making the characters too out - of - character. Naruto is known for his determination and loyalty, so if you write him as cowardly or disloyal, it won't feel right. Another mistake is ignoring the established rules of the Naruto world. For example, the way chakra works is a fundamental part of the series. Also, don't overuse jutsu without proper explanation. Just randomly having a character use a super - powerful jutsu without any training or buildup is unrealistic.
In a reborn OC as Naruto fanfic, a big mistake is ignoring the cultural and social aspects of the Naruto world. The clans, the village hierarchy, and the ninja way are all important. If your OC doesn't understand or respect these, it seems out of place. Also, don't make the story all about the OC. The Naruto world has a rich tapestry of characters and events. You need to integrate your OC into this existing framework. For example, if there's a festival in the village, your OC should participate in it in a way that's in line with the Naruto culture. And don't forget about the emotional depth. Just like the canon characters have their own traumas and joys, your OC should too.
A big mistake is ignoring the existing lore of the Naruto world. This includes things like the history of the ninja clans, the significance of the tailed beasts, etc. Also, don't make your story too predictable. Fans of Naruto fanfiction like to be surprised. And avoid writing overly complex plots that are hard to follow. Keep it engaging but simple enough for readers to understand.
Avoid starting with too much backstory. For example, don't begin by explaining the entire history of the character's family tree. Readers usually want to get into the action or interesting part right away.
In a self insert OC RWBY fanfic, avoid having the OC steal the spotlight from the main characters all the time. Their presence should enhance the story, not overshadow it. Also, be careful with the power levels. If the OC is too strong from the start, it makes the story less interesting. And don't forget about the world - building aspects of RWBY. The OC should interact with the environment and the culture in a believable way.
Don't make the plot too confusing or hard to follow. Keep it simple and engaging.
Avoid info-dumping. Don't just throw a bunch of background info at the reader all at once. It can be overwhelming and boring.
One common mistake is making the OC too overpowered. In RWBY, all characters have their limits and weaknesses. If your OC can defeat every Grimm or character easily, it becomes less interesting. Another mistake is ignoring the existing RWBY lore. For example, the rules about Aura and Semblance. If your OC's abilities don't fit within these concepts, it can seem out of place. Also, poor character development is a big no - no. Just having a cool - looking OC isn't enough. You need to give them depth, like real - life people have emotions, motives, and flaws.
One common mistake is having too many sub - plots that confuse the reader. Another is inconsistent character development. And also, don't overuse clichés.
One common mistake is making the OC too overpowered. It can make the story uninteresting as there's no real challenge. Also, avoid making the OC a Mary Sue or Gary Stu. They should have flaws and weaknesses. Another mistake is not staying true to the Supernatural lore. The world has its own rules, and your OC's story should fit within those.