noun, noun which may take the genitive case particle 'no'
neophilia; love of new things; person who loves new things
Describes a fondness for novelty, new gadgets, trends, or experiences. Can refer to the trait or a person with that trait. Often used in a slightly self-deprecating or lighthearted way.
彼は新しもの好きで、最新のスマホをすぐ買う。
He's a neophile and immediately buys the latest smartphone.
新しもの好きの性格だから、いつも新しいアプリを試している。
Because I have a love of new things, I'm always trying out new apps.
好奇心旺盛 is a broader term for being full of curiosity, while 新しもの好き specifically emphasizes attraction to novelty and new things.
ミーハー refers to someone who follows fads or is easily influenced by trends, often with a slightly negative or shallow connotation, whereas 新しもの好き is more neutral and focuses on the love of new things itself.
Compound of 新し (archaic form of 新しい, 'new') + もの ('thing') + 好き ('liking'). The reading あたらし is an older form of あたらしい.