Well, the theme of growth is often present. Their brotherly bond changes and grows as they go through various adventures. For instance, they might start off with a bit of a strained relationship in some fanfics, but as they face more difficult foes and situations together, they learn to trust and rely on each other more. Also, the theme of sacrifice is common. Sometimes one brother will sacrifice his own safety or desires for the sake of the other in these stories.
One common theme is loyalty. Mario and Luigi are always loyal to each other in these fanfics, no matter what challenges they face. Another theme is mutual support. They help each other out in different situations, like Luigi helping Mario when he's outnumbered by enemies or Mario encouraging Luigi when he's feeling down.
A practical answer is Chapter 232, because it turns the idea into a concrete scene. The chapter opens with But soon, she suppressed this strange feeling and slowly began to speak,..., adds pressure through this birthdate suggests the end of your lifespan, Miss Zhou, are you..., and ends on The.
Look to Chapter 213 for the clearest answer. It begins with Jiang Cheng also noticed where Jiang Shixu's attention lay., keeps building through Although the corners of his mouth were still turned up, the warmth in his..., and lands on As soon as they were seated, Lin Manru picked up the public.
Look to Chapter 249 for the clearest answer. It begins with Jiang Yan's body subconsciously shivered twice., keeps building through Jiang, Jiang Li, why have you come back?" Jiang Li's icy gaze shifted away..., and lands on He deserves it!] [It was absolutely the right decision for Jiang Li to....
The best chapter pointer here is Chapter 249, "Maxing Out Wilderness Survival Skills!". It opens with Jiang Yan's body subconsciously shivered twice. and closes on He deserves it!] [It was absolutely the right decision for Jiang Li to....
Chapter 222 is the strongest chapter-level answer because it starts from How come they're even live streaming in a reality show?! and follows through on She was certain and sure that she saw scheming in them..
Chapter 210 is the strongest chapter-level answer because it starts from This was Zhao Lang's first public appearance. and follows through on Clearly, she used improper methods to get it..
Chapter 249 is the strongest chapter-level answer because it starts from Jiang Yan's body subconsciously shivered twice. and follows through on He deserves it!] [It was absolutely the right decision for Jiang Li to....
Chapter 219 is the strongest chapter-level answer because it starts from Qi Tianyu was somewhat freaking out. and follows through on Having any yield at all was already the show giving them face..
Look to Chapter 193 for the clearest answer. It begins with Jiang Shixu's eyes lit up when he heard there was a gift., keeps building through But the next second, he carefully asked, "Is this gift for everyone?" "No,..., and lands on Jiang Cheng was a prime example..