Shares in Bloks Group, a maker of Transformers and other toy figurines, as much as doubled on their Hong Kong debut on Friday, making a billionaire of their founder and underlining the surge in ‘kidult’ culture despite falling birth rates in the world’s second-largest economy.

Demand from Hong Kong retail investors was 6,000 times more than the amount of shares allocated to them, the second highest on record Shares of Chinese toymaker Bloks Group surged as much as 82 per cent in their Hong Kong market debut after its initial public offering (IPO) attracted huge demand from retail and institutional investors.