Obelisk Blue is the highest of the three dormitories at Duel Academy. The reason for its superiority over the other two dorms goes back to the fact Seto Kaiba is the owner of this school, and that he possessed "Obelisk the Tormentor" during Battle City.
The dorm is mostly made up of students who have connections and are rich. Luxurious interior design, high-quality rooming, and finer food are offered to the students who reside here. In order to start in Obelisk Blue, upon enrollment, not only does one needs to have high grades in the written examination, but they also need to have earned a diploma from another duelist prep school.
The dormitories are divided into separate sections based on gender. Dr. Crowler is in charge of the male dorms, while Fonda Fontaine is in charge of the female dorms. Contrary to popular belief, all female students that are accepted into Duel Academy are automatically placed in the Obelisk Blue dorms regardless of whether they have the skill necessary to have been accepted into dorm, with the exception of Blair Flannigan, who entered the Slifer Red dorms in a separate manner than the traditional entrance exams. The reason for this is because the lower two dorms do not have the appropriate housing, as Obelisk Blue is the only one with separate dormitories for both female and male students.
There is a running gag throughout the series where the characters of Obelisk Blue keep disappearing or transferring out of the dorm, despite the fact that it's valued as the place all the students want to be. This is seen with the creation of the Obelisk White, and the constant dorm rearrangement of Chazz Princeton.
The Obelisk Blue students are identified usually by blue long-tailed jackets with white trimmings, unlike the Ra Yellow and Slifer Red students, whose uniform jackets are shorter in length. However, there are variations on this jacket, as seen by Vellian Crowler, Atticus Rhodes, Zane and Syrus Truesdale's outfits. The most common variant are white jackets with blue trimmings (basically an inverted version of the standard male uniform). This version is supposed to be worn by second-years or higher (seeing as Chazz Princeton didn't wear one, and, after all, he was a top-ranked student) Obelisk Blue students, like Atticus Rhodes or Zane Truesdale. In addition, in the beginning of GX, another variant was seen for Obelisk blue males. In episode 4, there were also Obelisk Males with short jackets that looked similar to blue Slifer Jackets, and long Jackets.
For females, the typical Obelisk Blue attire consists of a white top with blue trimming, a blue miniskirt, and royal blue boots. However, a few students wear different outfits with their Obelisk vests (e.g. Missy).
Characters in Obelisk Blue
- Cronos de Medici / Vellian Crowler <Headmaster of Male Dorm>
- Emi Ayukawa / Fonda Fontaine <Headmistress of Female Dorm>
- Asuka Tenjouin / Alexis Rhodes <Graduated>
- Fubuki Tenjouin / Atticus Rhodes <Graduated>
- Ryo Marufuji / Zane Truesdale <Graduated>
- Jun Manjoume / Chazz Princeton <Here for half of the first year, becomes a Slifer Red for a year and a half, then returns to Obelisk Blue in the final half of the third year.>
- Takuma Saiou / Sartorius <Only half of the second season>
- Daichi Misawa / Bastion Misawa <Only in Obelisk White, but he was offered to move up to Obelisk Blue when he defeated Chazz in Episode 12.>
- Sho Marufuji / Syrus Truesdale <For a short period of time in the third season before leaving but comes back in the 4th season >
- Edo Phoenix / Aster Phoenix <Only briefly mentioned to be in Obelisk Blue after enrollment in episode 53>
- Rei Saotome / Blair Flannigan <Only for the fourth season>
- Misturu Ayanokouji / Harrington Rosewood
- Mokeo Motegi / Belowski
- Junko Makurada / Jasmine
- Momoe Hamaguchi / Mindy
- Takadera / Torrey
- Mukouda / Unnamed in the dub <Takadera's friend>
- Isaka / Unnamed in the dub <Takadera's friend>
- Taira Taizan / Damon
- Houzan Gokaido / Reginald Van Howell III
- Ran Kochou / Missy
- Harada and Teraoka / 2 of the Three Masked Knights.
- Yusuke Fujiwara
- Taigo Sorano
- Taiyou Torimaki
- Raizou Mototani
- Tsugio Kanda / Bob Banter <Only for the fourth season>
- Seika Kohinata
- Blue Berets
- Commander Koda <Dub Only>
All four of the Overseas Champions were allowed to stay in this dorm, even though they were not officially enrolled.
- Obelisk's dormitory design is highly inspired by French famous châteaux. The girl's dorm being based on the Château de Chenonceau while boy's dorm is similar to Château de Chambord.
- In the anime all the Academy girls belonged to the Obelisk Blue Dormitory.