Injustice 2: 15 Guest Characters NetherRealm Must Include
4. Muhammad Ali
Muhammad Ali was a legend in and out the boxing ring - a legend that was, sadly, taken away from the world in 2016 - but he was also the protagonist of one of DC Comics most fondly remembered celebrity specials, titled 'Superman vs. Muhammad Ali'.
The story's fairly self-explanatory (for the most part, if you ignore the whole alien invasion aspect to it), involving the then Heavyweight Champion battling a non-powered Superman to save the world from immediate peril. It's pure '70s cheese every step of the way, but it possesses an undeniable charm that more than warrants The Greatest getting an appearance in Injustice 2.
Giving players the chance to recreate Neal Adams' famous cover to the 1978 issue alone is more than enough reason to ascend Ali to Injustice's ranks. I can think of about a million better ways to remember one of history's most beloved personalities, but reminding everyone of Ali's association with DC Comics would make for a really fitting tribute - one that fans everywhere could get behind.