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.
People who say they are Green Day's greatest fans but have only ever heard their 'American Idiot' album. They dye their hair black and wear eyeliner like the lead singer. And then they buy converses and class themselves as 'punks'. They really and truly suck and have to get a life.
Green Day Trendy 1: "Look at me, I'm wearing eyeliner!!!!!!!!!1"
Green Day Trendy 2: "I've only heard one of Green Day's songs...ah well, I'm still their biggest EVER fan coz I wear a hoodie with their name on!!!!!!1!11!"
A person who recognizes trends before anyone else and then by the time other peoplestart to catch on (like the hipsters) the trendsters have already moved on.
Everybody keeps trying to copy the trendsters but they just can't keep up.