adult, grownup - a fully developed person from maturity onward

big cheese, big deal, big enchilada, big fish, big gun, big shot, big wheel, head honcho - an important influential person; "he thinks he's a big shot"; "she's a big deal in local politics"; "the Qaeda commander is a very big fish"

celebrity, famous person - a widely known person; "he was a baseball celebrity"

titan, behemoth, colossus, giant, heavyweight - a person of exceptional importance and reputation

elder statesman - any influential person whose advice is highly respected

eminence grise - (French) a person who exercises power or influence in certain areas without holding an official position; "the President's wife is an eminence grise in matters of education"

Excellency - a title used to address dignitaries (such as ambassadors or governors); usually preceded by Your or His or Her; "Your Excellency"

fixer, influence peddler - someone who intervenes with authorities for a person in trouble (usually using underhand or illegal methods for a fee)

heavy hitter - an influential person who works hard to promote the causes they are interested in

high-muck-a-muck, pooh-bah - an arrogant or conceited person of importance

kingmaker - an important person who can bring leaders to power through the exercise of political influence; "the Earl of Warwick was the first kingmaker"

bigwig, kingpin, top banana - the most important person in a group or undertaking

magnificio - a person of distinguished rank or appearance

public figure, name, figure - a well-known or notable person; "they studied all the great names in the history of France"; "she is an important figure in modern music"

policy maker - someone who sets the plan pursued by a government or business etc.; "policy makers often make the right decision for the wrong reason"

power broker, powerbroker - a person who is important by virtue of the people or votes they control; "a power broker who does you a favor will expect you to return it"

sacred cow - a person unreasonably held to be immune to criticism

sirdar - an important person in India

socialite - a socially prominent person

sun - a person considered as a source of warmth or energy or glory etc

dignitary, high muckamuck, high-up, panjandrum, very important person, VIP - an important or influential (and often overbearing) person

worthy - word is often used humorously