noun
novelty lover; fad chaser
Describes a person who is always attracted to new things or the latest trends, often with a slightly critical or teasing tone. The 屋 suffix marks a person with that trait.
彼は新しがり屋で、最新のスマホが発売されるたびに買い替える。
He's a novelty lover and replaces his phone every time the latest model comes out.
Our boss is a fad chaser, so he jumps on any new project right away.