the multiverse arc is finally here!! seeing all these versions of black is really fun.
i think 羅 comes from 阿修羅, the way they write "Asura" in japanese. that fits in a bit more with how the rest of the characters in karakuri black's name are fighting-themed.
also sorry to to point it out but the ヨ in ヤバヨロ next to your doodle is written backwards. your jk black head is very cute, though.