The Celestial Dragons all speak respectfully to each other and use extremely respectful titles for each other- for example, Shalria and Charloss both call their father お父上様/o-chichiue-sama, which is something along the lines of ‘great honorable father.’
Likewise, all the normal civilians also speak very respectfully to the Celestial Dragons, using ください/kudasai and sometimes even polite forms even when the Celestial Dragons are committing atrocities against them- for example, the nurse that Charloss decides to make his wife and her fiancé are extremely respectful and humble in begging for mercy, which is super fucked up.
Zoro is probably the first person to speak like this to a Celestial Dragon in quite a long time.









