sunshine;

someone (male or female) who is just your everything, they don't have to be someone you know personally they can be a famous person or even a fictional character, but it's just someone you love and care for who makes you smile in your darkest times just by a simple action.
person 1: whos that person you're smiling at on your phone? 
person 2: just my sunshine, they make me smile when i'm upset.