How to sign: a person whose actions and opinions strongly influence the course of events
Similiar / Same: influential person, personage
Within this category: big shot, celebrity, colossus, elder statesman, eminence grise, Excellency, fixer, heavy hitter, high-muck-a-muck, kingmaker, kingpin, magnificio, name, policy maker, power broker, sacred cow, sirdar, socialite, sun, very important person, worthy