Would it be illegal to download Naruto fandubbed episodes and some fandubbed music and then put it onto a blu ray disc and make your own custom blu ray but not sell it?

Answer 1

All created material is copyright, whether commercially generated or not.

Making a copy of any copyright material is against copyright laws in most jurisdictions. Distributing such material is considered more serious but it is the copying that is against the law. Making a custom disc is therefore in breach of copyright.

WikiAnswers cannot endorse or condone any breach of the law. One might consider if the owner of the copyright material would approve of the copying or not. If there is no commercial loss for anyone, the copyright holder may well ignore the breach.