>>309765
Dumb human psychology reasons.
It's literally less mental energy to see yourself in something that looks like you. So when you're talking about "realistic" characters, their perceived race can change the way you relate to them. With abstract characters, like cartoons, features become more universal, so you end up with the perceived Black-ness of Bugs Bunny or Bart Simpson.
That means it is (on average) *literally more relaxing* to play a videogame that features a character who you perceive as being the same race as yourself. This is less meaningful on the level of one specific game, where a variety of factors can influence whether something is fun to play, but in aggregate across dozens of games released over several years, not encountering characters that seem like you can create a general air of games (or television, film, musical theater, etc) being "for" other people and not you.
That's one reason why some people care about media representation of different kinds of people.