Everyone who begin their names in the Join the Organization XIII link gets a keychain (official or fan made) artwork of their choice of colors, it's nothing special it looks like a nobody/Roxas's zipper emblem with a checker chain also your choice in colors. Just keep in mind this charm can link those back to the darkness with the Portal to the Dark link.
Picture examples coming soon....
Aera
Username: Dragon Anime
Trained by Group Leader Axel
Group: VIII (8)
Member No.: XIV (14)
Trained: N/A
Currently Training: N/A