A Japanese anime specifically targeting SEGA fans has had a familiar face play a significant role in the show. Episode six and seven of the anime SEGA Hard Girls had Sonic the Hedgehog himself make a notable cameo in the show. So much so that he literally became the driving force in the plot of episode seven and helped save the day more than any other SEGA character that had appeared in the show before him.
SEGA Hard Girls, or Hi☆sCoool! SeHa Girls as it is known in Japan, is an anime starring three female anthropomorphized SEGA consoles. The trio, Mega Drive, Saturn, and Dreamcast, enroll in SeHaGaga Academy at Tokyo’s Haneda Ōtorii station where their teacher assigns them to enter SEGA games. By completing certain objectives in those games they earn medals. When they collect one hundred of them they can graduate. The series is heavily influenced by SEGA as a whole. No stone is left unturned. Fanservice is off the charts in every episode. The more of a SEGA fan you are the more you’ll get the jokes.
In episode six the girls travel into the arcade game Border Break and are about to complete their mission when the game world is hacked by none other than Dr. Eggman. All seems lost until the only one powerful enough to stop him arrives: Sonic. The entirety of episode seven focuses on Sonic and Eggman’s battle with the girls tagging along for the ride. There are plenty of Sonic fanservice in the process and the battle goes so out of control that the girls even find themselves going into Sonic’s past games! You can check out the series over at Crunchyroll.
As of this article’s writing episode seven has gone up only within the past few hours. For now, however, you can see the end of episode six where Sonic first appears in the video provided below: