Several newspapers are currently running stories about the Yeti being for real — here's an example from the Guardian, a serious British newspaper.
The main difference with the usual Yeti stories is that in this case the creature does not inhabit the Himalayas but the Altai Mountains. In Celestial Empire gaming terms, this would place its home at the boundary between Western Siberia and Outer Mongolia.
Another difference is that apparently we're not talking about a brutish ape-like creature any longer, but about a cunning, more human-like creature, that has been able to keep its existence hidden from civilisation for centuries.
As a consequence, I would introduce the Yěrén (野人, this has traditionally been the name given to the Yeti in the Chinese language) to The Celestial Empire as a cunning, humanoid creature, possibly related to the Men of Leng of Lovecraft fame — if you favour this kind of cross-over. Yěrén could even be introduced as the waking world equivalents of the Men of Leng.
STR 3D6 (10-11)
CON 3D6 (10-11)
SIZ 2D6+6 (13)
INT 3D6 (10-11)
POW 3D6 (10-11)
DEX 3D6 (10-11)
APP 2D6 (7)
Move : 8
Hit Points: 12
Damage Bonus: None
Armour: Shaggy fur 1 point + may wear stolen armour
Allegiance: Roll 1D100: 1-60: Shamanism 10D6, 61-100: Heterodoxy 5D4
Craft (crude implements) 25%, Dodge 30%, Grapple 30%, Hide 25%, Knowledge (own region) 75%, Science (Natural History) 65%, Spot 40%, Stealth 60%, Throw 45%, Track 45%.
Whatever spell a Yěrén knows will have been taught him by some "master" it serves/worships. This can be of particular interest in a cross-over Call of Cthulhu/Celestial Empire game, where said master can be a Moon-Beast, a priest of Nyarlathotep, or a cultist of the Black Lotus.
Heavy club 25%, damage: 1D8+db (crushing)
Hit Location Table: Use Humanoid.