In my field, a leader is a creative, knowledgable, has great emotional intelligence, and enjoys changing their means and method of communication in order to get through to a larger content.
Trainers are social, creative, and always yearning for a better way to transmit knowleadge and find ways for better retention. We also have to be able to diffuse difficult situations, understand there are always better ways to pass on knowledge, and that it takes a team and buy-in from others to continue to practice and apply the knowledge once they leave the classroom (virtual or physical).