Status: corroborated (one data point at frontier 307) · Technique: name-etymology + name-encodes-a-system + folklore-encoding
The seed
The name is doubly encoded:
Primary color — ao (blue), one of the three primary colors.
Momotarō companion — the pheasant is one of the three animal allies (pheasant / dog / monkey) who accompany the folk-hero Momotarō (“Peach Boy”) on his journey to Onigashima.
At frontier 307 only Aokiji is on-page, so the system is a single-data-point hypothesis: that EVERY admiral name will follow the same primary-color + Momotarō-animal template.
The payoff
Earliest known caller
Universal — the “primary color + Momotarō companion” decoding is standard fandom reading, surfacing as soon as 2+ admirals were named. No single first-caller.
Why this matters
This is name-encodes-a-SYSTEM, not just name-encodes-a-character. Oda doesn’t merely hide a trait in one name — he installs a generative template (color × folklore-animal) that an attentive reader can use to predict the form of names not yet revealed. It is the Marine-HQ analogue of how crew-naming or D-naming patterns let a reader anticipate the shape of future reveals.
Sources
Japanese 青雉 = “blue pheasant” (青 ao / 雉 kiji)
Momotarō folklore — pheasant / dog / monkey companions