THESAURUS
faddist
addict, bug, collector, craze, demon, eager beaver, energumen, enthusiast, fad, faddiness, faddishness, faddism, fanatic, fiend, freak, great one for, hobbyist, hound, infatuate, novelty, nut, pursuer, rage, rhapsodist, sucker for, visionary, wrinkle, zealot