Is writing about the impact of being bi-racial had on me a good essay topic for colleges?
The purpose of the college essay should be: 1) to say something about yourself that can’t be found elsewhere on the application and; 2) to give admissions officers a reason to want to have you on their campus. Any topic should be fine as long as it meets those criteria.
Some essays I find really interesting and hooking to read are those that begin with a (seemingly) insignificant topic like playing boardgames with your family, mowing the lawn, origami, etc. that can transition into meaningful themes that show you/personality/values.
A suggestion would be to start with a ‘random/unique topic’ then transition into talking about being biracial.
Take these as only suggestions/grain of salt, if this topic truly helps deliver the points you want to get across, then it should be fine.