Gaia Mascot is the unofficial term for various Gaia Online characters that represent the site, staff, or feature in some form.
- NPC:Admin is Gaia Online's all purpose Administration bot. She handles random tasks from announcements to informing the user that their item has been sold.
- NPC:Stein is a male character that was created to collect glitch reports about Evolving Items. His arrival was announced on Gaia was in October 2009.
- MsTransaction was a mule created in 2004 by DARKNRGY (a Developer). She was specifically made for reporting Marketplace bugs. Although it is unknown if she was useful with this task.
- Gaia-tan is a Chance Item released in May 2009, found in the Item:Gee Boi Turbo, she is Gaia Online's Moe anthropomorphic avatar. Her item description is Japanese text written in Hiragana: かわいいですね~? (kawaii desu ne?) (It's cute huh?).
- Gaia-sama is a Chance Item released in August 2009, found in the Dark Reflection, she is Gaia-tan's Alternative Universe counterpart. Her item description is Japanese text written in Hiragana: 高いですよ~! (takai desuyo ~!) (It's expensive~!).
- Gaia-kun is a Cash Shop item released in December 2009, found in the "Gaia Gaia Party Time!" item with Gaia-tan. The item description is in Japanese text written in Romaji: Shinnen akemashite omedetou gozaimasu! (新年 明けまして おめでとう ございます!) (Congratulations on the dawn of a new year!)
- Tenshi Gaia-tan is a Cash Shop bonus item from the Gaia Ascended Bundle released in July 2010. The item description is in Japanese text written in Hiragana: 私はangel~でありたいと思う~! (watashi ha angel~ dearitaito omou ~!) (I want to be angel ~!)
- Rock Puppy is considered the original mascot of Gaia, and was originally located on the front page of Gaia Online mainly in 2003 and onward.
- Moobie was a hamster creature that use to occupy the Homepage in 2003 and 2004. Its likeness was used for the creation of the Item:Hammi Hat. The story behind Moobie's presence on the homepage was said to be a tribute to the deceased pet of one of Gaia creators, but this not confirmed.
- Item:KiKi Kitty Plushie is a Monthly Collectible released on March 2005. Kiki's image is used for many of Gaia's merchandise.
- Item:CoCo Kitty Plushie is a Monthly Collectible released on October 2005. Coco's image is used for many of Gaia's merchandise.
- Gaia-tan bears a resemblance to the female model seen in the July 2006 MC promo. She was the first item with a Winking eye pose, and the first item with Japanese Hiragana as the description.
- Tenshi Gaia-tan is the second time Gaia-tan was a purchasable companion from the Cash Shop. As a Tenshi she is wearing the Angelic Set, an old set of items from 2003.
- During 2004, Gaians started a project called, Forum-tans project. This community creation was an attempt to create various personified characters based on Gaia's main forums. A manga by Sushi Database Studios was spotlighted in the announcements during Summer 2k7: Summer Festival.
- Gaia Thread: Forum-tans: All that and maid outfits (GCP THREAD OPEN)
- Gaia Thread: Forum-tans: All that and maid outfits
- Announcement: Summer Fest News: Event Prizes, Salon Update, Item Contest!
- Gaia Thread: Move over old Gaia-tan. Meet new Gaia-kun!