* The "Gillington" character is a newer addition: The Gillington character debuted in the recent Monster High reboot series.
* New dolls are released regularly: Mattel, the company that produces Monster High dolls, releases new dolls and sets frequently.
Keep an eye out! It's possible that a Gill doll could be released in the future, especially with the growing popularity of the reboot series.
You can check the Monster High official website and social media pages for news about upcoming releases.