How to understand a different perspective for characters?

Hi. So I want to make a story, but I want the characters to flourish with diversity (disabilities, race, personality, etc.) but I don't know how to make a character through their eyes. Say they had epilepsy, I want the character to be relatable and true to other epileptic people, so I would like stories through other peoples eyes. Any perspective is helpful to me to create realistic characters. I want YOUR perspective.