stickler (noun)

1. Sarah's boyfriend is a stickler for romance, always planning surprise dates and showering her with love notes.

2. In Greek mythology, Zeus is depicted as a stickler for justice, always ensuring that the laws are upheld.

3. Emma is a stickler when it comes to fashion, carefully selecting every accessory to create the perfect outfit.

4. As an anime stickler, Jacob can easily recognize and name every character from his favorite series.