The Order of Grammaton (usually abbreviated as "Grammaton") are the Protagonists of the fanfic Bakugan Universal Avengers: Mission Grammaton.
Headquarters: Mothership Winchester
Members: 10 (Brawlers), 20+ Bakugan
Key People: Antheus Michaels; Yuri D Izayavitch
- Yuri D Izayavitch (Father of the Grammaton from 19 BMS to present)
- Volt Luster (Haos Brawling Operative, 2nd-in-command from Arc 4)
- Marduk Kreig (Darkus Brawling Operative)
- Protheus Michaels (Subterra Brawling Operative)
- Chryslar Zeit (Pyrus Brawling Operative)
- Jules Liger (Aquos Brawling Operative)
- Rengoku Houran (Ventus Brawling Operative)
- Mizuhiro Mikado (Hitman)
- Shun Kazami (Special Operations Spy, presently affiliated)
- Masquerade (Special Operations Spy, presently affiliated)
- Serena Sheen (Temporary Second-in-Command Arc 2-4)
- Antheus Michaels (Deceased, Co-Founder and Father of the Grammaton from 22-19 BMS)
- Genesis Wright (Traitor of the Grammaton)
- The Order of the Grammaton and the monicker of the leader as "Father" were inspired from the Order of the Tetragrammaton from the 2003 Sci-fi film Equilibrium.
- The Grammaton are not limited to male members. As a matter of fact, Yuri is upset that there is not yet a permanent female member. Serena Sheen is the only female to ever become a member of the Grammaton but she left after Arc 4 and had entrusted her office to Volt Luster.