Kameo: Elements of Power Easter Egg - Hidden Character from Conker

Go to the Thorns airship level, specifically the part where you must use Snare to throw the Armoured Trolls into the fans. On the wall, there is a large boiler. Fans of Conker: Live and Reloaded (also made by Rare) will recognise it as the Brass, Bourgeois, Big Bollocked Boiler, one of the bosses from Conker!