I think theirs not one way to be influential with your co-workers. Sometimes you have to be the helping hand or sometimes you have to be the one who solves everybody problems. To be influential, you have to be popular and to be popular you have to be a good leader. I had someone in my class, who use to solves others problems. My classmate was so influential that I trust him enough to ask for a service that would do my class online and I do not regret it one bit since he provided me with a good service.