One popular theme is her friendship with the other Pink Ladies. Fans often explore how they support each other through the ups and downs of high school life.
There are many Grease fanfiction sites out there. You could try FanFiction.net. Just search for Grease and filter through the stories that focus on Rizzo's character development, her friendships, or her adventures at Rydell High without the pregnancy aspect.
The main characters are Rizzo and Kenickie. Rizzo is often portrayed as a tough - talking and sassy character, while Kenickie is more of a laid - back but still cool guy.
Perhaps the fanfiction could explore how their friends react to the news. Their friends might be shocked at first, but then some could offer support while others might distance themselves, adding drama to the story.
Another theme could be exploring the backstories of the other characters in the Grease universe. Like how Rizzo got to be the tough girl she is, with fanfiction delving into her family life or early experiences in high school that shaped her.
A common theme is their friendship. Since they are teammates, many fanfictions explore how they bond off the field as well as on it. Another theme could be their competitiveness in the game, showing how they push each other to be better players.
Sandy is also a popular choice. Her transformation from the innocent new girl to a more confident young woman gives a lot of room for creativity in fanfiction. Writers can expand on how she adapts to the new environment and her relationship with Danny in more depth.
Grease science fiction might be a very niche or even newly - coined term. It could refer to science - fiction stories that involve machinery or mechanical elements that are 'greasy' in the sense of being industrial and mechanical. Think of a story set in a steampunk - like world where the gears and engines are constantly greased, and this aspect of maintenance and the properties of grease play into the plot, such as a malfunction due to a lack of proper greasing causing a spaceship to be in danger.