Though I can read Chinese (somewhat… at a tenth of the speed), I would much rather read the English translation. And I hope you will continue to post up Saiunkoku when newer novels/magazines get published. I thank you, thank you, thank you.

Now I will present my crazy deductions.

Confirmed sages:

Shi: Shou Tashi
Kou: Dr Yo
Haku: To Eigetsu

People in my own wacked out speculation that could be sages (pardon if you think the ideas are strange. I just came up with them myself without any references or suggestions, other than my own inferences from reading your translantions):

Shokun aka Barahime, possibly the sage of Kou, who now resides in Kou Shurei. Shurei is a miracle baby, her mother was supposed to be barren (maybe because she wasn’t meant to be that is why she was always sick as a child). Therefore Shurei is probably barren too because she is a sage? That is why Oo Oo doesn’t want her to be the sole Empress? It was also stated somewhere that Shou Taishi is envious of Sa Enjun and his life with Eiki. Maybe sages can’t have children? And if they do, they lose their powers? (I think Barahime lost her powers after having Shurei).

Tei Yuushun: He could be one of the sages and a secret descendant of Shi or Kou. Was stated that Yuushun came from a prestigious background. Part of the reason he kept refusing Sai Rin is his inability to sire children? He has said some really strange things. Partly gut feeling.

Ran Ryuren: One of the sages. I am not sure if he knows or not.

Sa Sakujun: One of the sages. I know this probably sounds the strangest.

Shi Seiran: One of the sages but he doesn’t know it, kind of like Shurei. I don’t really know why I think so. Gut feeling?

Those are my top choices but there are some that I suspect as well, like:

Kouki
Anju
Reishin

Ok, enough insanity.

No idea.