Culture
Ryukyuan
set_culture ryukyuanCulture ID ryukyuan. set_culture changes the culture of the character you play; change_culture <county id> ryukyuan changes a county's. Both need the debug mode (launch option -debug_mode).

Traditions
The traditions this culture starts with, and what each one does.
Spiritual ethos
While some cultures turn to war and others to worldly knowledge, this culture places its trust in the only constant throughout its history - the divine. Spirituality is the only way forward in a harsh and uncaring world.
Characters of this culture
- Consult the Skies Decision has additional effects
- Characters of this Culture have increased Stargazer Aptitude
Martial custom: Men Only
- Only men can be Commanders and Knights
Other Japonic cultures
Source: game/common/culture/cultures/00_japonic.txt, game/common/culture/traditions/00_societal_traditions.txt, game/common/culture/traditions/00_realm_traditions.txt, game/common/culture/traditions/06_ce1_traditions.txt, game/common/culture/pillars/00_ethos.txt, game/history/provinces (counties at the start) and the English localisation, Crusader Kings III 1.20.0.3.