One who initiates or popularizes multiple unconventional/out of the box trends good for long term for the field(s) he/she is active in.
Doing things done never before & setting new trends with effective use of creativity in an inspiring manner.
In a nation obsessed with traditional careers, Trendster Anand is only undisputed World Chess Champion in history who inspired numerous people to choose a career in sports.
A person who recognizes trends before anyone else and then by the time other people start to catch on (like the hipsters) the trendsters have already moved on.
In discussion forums when old threads are reasponded to from several years go and everyone else wonders how and why the thread was brought back to life. Usually, any questions in the original thread have been answered and are no longer pertinent. Rarely are the original posters still active.
"Who's responding to these posts from 4 years ago?"