You can start by researching different ethnic cultures to get accurate details. Then, make the characters' ethnicity an integral part of their personality and experiences. Don't just use it as a label.
In pulp fiction, race and ethnicity are often stereotypically represented. For example, certain ethnic groups might be depicted as having specific occupations or behaviors. Asian characters could be shown as martial arts experts or sly businessmen. African - American characters may be portrayed as having a particular style of speech or being involved in criminal activities more often than not, which are unfair generalizations.
In most comic book scenarios, a man's ethnicity is usually a fixed trait and not something that can be changed easily. But it could happen in very imaginative or fantastical storylines.
Well, in the realm of comic books, a man's ethnicity is generally not something that can be randomly changed. It would go against the established character traits and the overall consistency of the story. But there might be some extremely rare cases with extraordinary circumstances that allow for such a concept.
There could also be issues related to cultural appropriation. If the ethnicity change in the story is used in a way that exploits or misuses the cultural elements of a particular ethnicity without proper understanding or respect, it is unethical. For instance, using religious or cultural symbols just for the sake of a fictional 'change' without respecting their significance in the original culture.
I'm not sure exactly who Michelle Brown is without reading the story in detail. But she is likely the victim of identity theft in this particular account.
Race and ethnicity can drive the plot in pulp fiction. For example, a story might revolve around a conflict between different ethnic groups. It could be a rivalry between white settlers and Native Americans, where the differences in race and ethnicity fuel the tension and the action of the story.
Michelle Brown is the victim of identity theft in this story. She is the central figure whose experience with having her identity stolen is being told.