Based on the provided photos, your plush keychain displays strong indicators of being authentic.
Here is a breakdown of the specific authenticity features visible on your item:
• The Left Foot Stamp: Your second image shows a crisp, deep, and perfectly aligned embossed stamp on the left foot reading POPMART © Kasing. Counterfeit versions (often called "Lafufus") usually have a blurry, shallow stamp, typos, or the stamp is missing entirely.
• The Right Foot Silhouette: Your third image shows a molded, hollowed-out shape of a Labubu silhouette on the bottom of the right foot. For certain plush series, this serves as the designated spot for the hidden authentication mark.
• The Face and Tooth Count: In the first image, your plush has exactly nine teeth. Counting the teeth is the most classic "quick check" for collectors, as fakes often get this wrong and feature 8 or 10 teeth. The peachy skin tone, centered eyes, and evenly airbrushed cheek blush also align with genuine manufacturing standards.
• The Fabric Labels: The ribbon loop near the keyring and the plush's body tag both read THE MONSTERS with the correct font style, bolding, and alignment.