Here's another perspective:
In many states, your juvenile record will be considered in your character evaluation. Hopefully, you weren't too bad. Typically resisting arrest is not going to prevent you from practicing law, but you would probably do better to call the state bar that you are considering taking and ask someone in the character/fitness section. Often, but not always, law schools will allert you to potential problems (thats why they ask for the info on the application). The biggest mistake you can make is not being 100% candid, accepting of responsibility, and contrite.
Most law schools will consider your diversity as a plus. Not for "PR" or reporting reasons, but because of the way that law school is taught (here is an article on the Socratic Method
). Emphasizing the unique experiences and perspectives that you will bring to the class is a way to get a leg up from your background. At any law school, however, non GPA-LSAT factors are probably seriously considered in only about 15% of the applications. The rest of the applicants are either accepted or rejected on the GPA-LSAT combination alone. There are many places that you can guage your chances online once you have your LSAT scores. The GPA only considers undergrad.
Good luck on the LSAT, and let us know how it works out for you!