there's absolutely no references to Fujin in the coalesced outside of these krypt/gallery art references:
mItems
(mBaseImageName="NPC_Fujin_00",mPackageName="GalleryArt16",mCategory=kGalleryCategoryConceptArt_NPC,mIsChild=True)
mItems=(mBaseImageName="NPC_Fujin_01",mPackageName="GalleryArt16",mCategory=kGalleryCategoryConceptArt_NPC,mIsChild=True)

That's all there is. the only fightable NPCs(outside of what seems to be ShokanMale and a generic Male and Female one) are Tanya,Rain,Baraka,Sindel and Corrupted Shinnok.
That's very likely a troll on twitter.