A theme of discovery is also quite prevalent. They might discover new power - ups, hidden areas, or secrets about each other. For example, Pauline could discover a hidden ability within herself while Mario might find a new way to defeat enemies. The fanfics also often have a theme of overcoming challenges, whether it's big bosses or difficult terrains.
There's also 'Mario and Pauline: A New Odyssey'. In this fanfic, the author explores the idea of Pauline having special powers that she discovers during her journey with Mario. It's a bit different from the usual Mario stories and gives Pauline a more central role, which is really interesting.
A theme that pops up a lot is heroism. Mario is his usual heroic self, and Pauline often shows her own brand of courage too. They work as a team to overcome challenges. Also, friendship can be a theme, as their relationship can start as friends and develop into more.
You can start by looking on fanfiction websites such as Archive of Our Own (AO3). It has a large collection of fan - created works, and there's a good chance you'll find some 'Mario x Pauline fanfic' there. Just use the search function and type in the relevant keywords.
One great 'Mario x Pauline fanfic' could be about their adventures in a new, undiscovered kingdom. Maybe they team up to rescue the Toads who have been kidnapped by a new villain. In this fanfic, Mario's bravery and Pauline's intelligence could be highlighted as they face various challenges like tricky platforming sections and puzzles.
One idea could be that Pauline gets kidnapped by Bowser and Mario has to go on an extra challenging adventure to save her. He might face new types of enemies and obstacles along the way.
Maybe Mario saves Pauline from a series of dangerous situations, and as a result, Pauline begins to see Mario in a new light. She starts to do things to show her gratitude, like making him special power - up treats. This back - and - forth interaction can develop their relationship.