Hello, I am 2Weeb4this currently a 26 year old woman. I believe my ethnicity and or sexuality shouldn't matter to anyone. 
Good writing is a literary art form in which we can stand in any story and explore many feelings and journeys. Therefore, let's ride into these stories together. 
Many of my stories will not have an existing background or much detail of characters when it comes to fanfics because I believe it would be nice to have a relatable character who doesn't dig into families or ethnicity. Instead, I leave that for the reader to decide. Such as by adding country of origin, also I will not mention body types or height unless they need to be mentioned if requested. Other than that my main purpose is for every reader to enjoy my fics without specifics of theirs. To be under the role and feel like the main character is you.