Prosecutors are reportedly seeking a prison term and a near-£1m fine for ex-Sega developer Yuji Naka

One of Sonic the Hedgehog’s creators is facing possible jail time and a fine of close to £1m for his alleged part in an insider trading scheme, according to a court report by Japanese media.

Yuji Naka, who co-created Sega’s blue-spiked mascot, was arrested in November last year over allegations he traded in stock with privileged information for a significant profit.