In general, the ability for a minor to obtain a restraining order against an adult depends on the laws of the specific jurisdiction. Many places require that there be a valid reason, such as harassment, threats, or physical harm. Simply wanting a restraining order "for no reason" is unlikely to meet the legal standards necessary to obtain one.
Additionally, since minors typically do not have the legal capacity to file a restraining order on their own, they may need a parent or guardian to help them navigate the legal process. It’s important for anyone considering this step to consult with a legal professional or local authority to understand the specific requirements and process in their area.