Treating themes, such as Feminism, Civil Rights, the Depression, Beauty, Death, etc., as actual characters is a super fun practice in writing.
You can go as far as including an actor in your script that personifies your theme. Complete a character breakdown and backstory for the character, including giving them a name. Imagine Feminism being named Candy. (So much fun to be had there!) Give your character a personality by adding in habits or rituals.
Here are a few habits Death may practice depending on the personality to be portrayed:
She keeps a compact mirror and lipstick handy. She methodically applies lipstick whenever she is about to take a life.
He keeps a pair of dice in hand, but never rolls them.
She's always reading, and you're never sure if she's listening to anyone.
Props with Purpose
Most of us will not personify our themes into full-blown abstract characters. Instead, consider using props to represent themes. Though it's a seemingly more subtle approach, a prop provides opportunities for our characters to physically interact with the symbol you assign to your theme.
Imagine Lipstick as a symbol of Power. A character breakdown for Susie may include this description: Susie keeps a compact mirror and lipstick handy. She methodically applies lipstick whenever she is about to take over a situation or conversation.
Love may be symbolized by Dice. We see that Lewis always keeps a pair of dice handy, but never rolls them.
You can treat a prop like a character in your prep: give it an backstory, including an age and a name. Do everything to the prop you would a human character. Put it at risk, give it a desire or need, and take it on a journey where change is important.