You can unlock Shin Akuma in Ultra Street Fighter II: The Final Challengers with a special code

Capcom announced during their Street Fighter 30th anniversary San Diego Comic-Con showcase that Shin Akuma is actually unlockable in Ultra Street Fighter II: The Final Challengers for the Nintendo Switch. 

Here's what you'll need to do to use him: 

• 1. Select Ryu, cancel on Color 1
• 2. Select Ken, cancel on Color 9
• 3. Select Sagat, cancel on Color 8
• 4. Select M. Bison, cancel on Color 7
• 5. Place the cursor on Random, press L and R at the same time

Shin Akuma can't be used in local online and internet battles because he's crazy overpowered (two air hadoukens), but this is very nice! Love little Easter eggs. 

How To Unlock Shin Akuma In Nintendo Switch's Street Fighter II [Gamespot]