Fighting can be viewed as a branch of sports, which also attracts a lot of black males. Athletics is a language shared across cultures, moreso than elves or alien invasions. There is also the physicality aspect, it being more prized in black communities. The familiarity around street fights, boxing gyms, and beatdowns if grew up in the inner city.
Btw, American ghettos are maybe not the same as ghettos elsewhere. Here, they have a lot of the same luxury goods the suburban kids have, don't be fooled. Blacks and hispanics in the lower class 'hoods have a lot more spending power than outsiders are lead to believe, difference is they have a tendency to spend on liabilities, not assets. Well, that's the tendency of the average American regardless of race, there's just many more business and land owners among whites and asians. I've been in many black homes, and nearly all of them had up to date consoles. A small few had gaming PCs, but of course those were the nerds.
And yes, blacks and hispanics, especially the millennial eses, LOOOVE DBZ . It's crazy how I can go anywhere, and if there are some young Mexican males around, there is a high chance I'll overhear some comment or convo about the anime. Well DBZ characters are essentially superheroes, and superheroes seem to be the kind of fantasy they largely prefer, not European medieval type shit. Stan Lee is their Tolkien.