Destructoid editor Jonathan Holmes put together this chart (and others) detailing the generic archetypes that most black videogame males go through, classifying them into different categories. This is entirely satirical, but the chart did summarize what I usually think when I see black males in games. Which is sad, really.
For the term "Grape-y:"
"Whenever someone is closely associated with dark blue or purple, they could be considered "Grape-y". It could be in the clothes they wear, the color of their attacks, or even their skin color. Either way, it's all Grape-y."
http://www.destructoid.com/let-s-look-at-tropes-vs-black-guys-in-videogames-263637.phtml