Rather than focus on the phenotypical nature associated with "Blackenese"-ness, I'd rather expand the definition to include any/all feelings of disconnect that a person might experience, especially relating to his/her socio-cultural and/or socio-racial background. In this way, "blackenese" might actually stand in for "liminality" but, in a specifically ethnic/racial/cultural context. Thereby, a person's physicality becomes irrelevant. It doesn't matter whether or not one is physically displaying characteristics that are considered to be either "Black" or "East Asian," what will matter most is the interior/internal conflict experienced by all those who feel polarized by the categories imposed upon them by the dominant mainstream.
Blackened Death Metal is a subgenre of metal music that combines elements (ideological or otherwise) of black metal and death metal. Blackened Death is usually confused with black which is understandable however there is a noticeable difference between black and blackened death. Blackened death metal may commonly utilize lower tuning than used in conventional black metal however still uses the trademark alternatively picked minor chords. You really could think about it as black metal with more bass or lower pitched black metal. Blackened death is also usually far more satanic in lyrics and imagery than standard death metal and it is also a little more thrashy. Blackened death metal is an excellent hybrid genre because it combines the most evil with the strongest and puts it into one animal, so to speak, resulting in the most serious possible music that everyone would find either scary or badass with no amusement whatsoever.