Ohio has a clear right to self-defense when death or serious bodily injury is threatened. However, if you use your firearm in self-defense, there must be evidence that you reasonably believed that you were at a high risk of imminent serious bodily injury or death.
Keep in mind that felons and other prohibited parties may run into criminal charge issues if they use a gun in self-defense. The state will have questions relating to the possession of the firearm by the prohibited person.