The original grey King Ken was produced as a special edition addendum to the In-Crowd House of Horror series. The legend of Ken grew from there and by popular demand Amos bought forth a veritable array of King Ken colourways. There was the infamous black blister pack series with orange Ken and the most rare white Ken. Then there was the flocked Vortigern’s Machine series starring brown Ken and the black Ken (lifted from the Ju Ju bun hallucination sequence in Vortigern's Machine and the Great Sage of Wisdom). And the last great rotocast ape was pink Ken, made in honour of Clutter magazine's first anniversary.
Recently US toy company Strangeco have produced a King Ken Mini series under license. These are 9cm redesigned mini versions of the King Ken character and come in 5 colours plus a special chaser version.