XMAS01 Revealed: PuddingBoss by ThreeA Toys
And while ThreeA Toys teased and released XMAS 02 and XMAS03 (revealed to be a 3-pack WWRp Bertie MK2, and a Peaceday Dropcloth 1/6-bot, respectively). XMAS01 has not been revealed, until now. The first (unknown) hint came in the form of an Christmas-greeting illustration from Ashley Wood (above-left / which was made into a card) and as a painted Bambaboss figure (also seen on the illo) was given as gifts to colleagues and friends only~ So yes, PuddingBoss was not for sale.
Source: 3A production blog / forum