Bleach's magic system is a liturgy: ninety-nine named spells in two orders, each with a fixed incantation, and the rule that skipping the chant costs you the power. The words are not flavor. The words are the weapon.
Documented
The numbered liturgy
The system's published structure: two orders, hado (destruction) and bakudo (binding), spells numbered 1 to 99, each with a fixed incantation, ye lord, mask of blood and flesh, all creation, flutter of wings. The doctrine is stated by the characters themselves: an incantation abandoned weakens the spell, and only masters may skip the verse and keep the force. It is a magic system with a grammar, a canon, and a heresy.
Assessment: Fully documented in the manga's own text. The spellcraft is speechcraft, explicitly, and the economy of the chant, full price or reduced power, is the series' cleanest piece of world-building law.
Stories
The kotodama ancestor
The folk reading connects kido to kotodama, the old Japanese belief in the spiritual power residing in spoken words, and to onmyodo, the yin-yang ritual tradition whose practitioners bound spirits with named formulas. On this account the demon way is the word way in work gloves: to speak the full name and verse is to bind the force properly, as it has been done in Japanese ritual for a millennium.
Assessment: The family resemblance is real and widely noted; the archive already keeps kotodama on file as its own entry. Kido is the pop-cultural descendant, and the lineage is as documented as such things get.
Interesting claims
The black coffin as scripture
The fringe favorite: the highest spells' incantations read like damaged scripture, and fans treat Hado 90, the black coffin chant, as a lost liturgy, transcribing, translating, and arguing over its imagery for years. Some go further: the abandoned-chant rule is a parable of modernity, every tradition trading full form for convenience, keeping the power by seniority alone.
Assessment: The chants are on the page and the theological reading is the fandom's own, filed here accordingly. But notice what the system actually teaches: the words matter, the seniority matters more, and the institution decides which shortcuts are allowed. That is not magic. That is every church and academy ever built.
Sources and further reading
the published system: hado and bakudo, spells numbered 1 to 99
the incantation rule, stated in-story: abandon the chant, lose the power
kotodama, the word-soul belief of Japanese religion
the onmyodo parallel: named formulas as binding contracts
Hado 90, the black coffin chant, as the fandom's damaged scripture
Worth asking
A spell you may abbreviate at the price of its power is a perfect metaphor for ritual itself. What do you still say in full because shortening it would feel like losing something?