If you are planning on becoming a PADI Instructor or PADI IDC Staff Instructor, you are also required to be an EFR Instructor.
Anyone can become EFR certified or an EFR Instructor, it is not even required to be a diver. These courses teach first aid and CPR skills that are valuable for everyone on the planet. As well as an adult First Aid and CPR Instructor you will become a Care for Children Instructor and will be able to teach infant and child CPR techniques.