Well, one possible sad story of Jigglypuff could be that it always tries to sing lullabies to put others to sleep but often gets ignored. It puts so much effort into its sweet singing, yet people or Pokémon just walk away or don't appreciate it. It's like an artist whose work is not recognized.
One common theme is friendship. Since Ash is a trainer and Jigglypuff is a Pokémon, their relationship is often explored in terms of how they become friends and support each other. Another theme is adventure. They are usually depicted going on quests or exploring new places.
One common theme is Jigglypuff's singing ability. Fanfics often explore how its song can have different effects on other Pokemon or humans in the Pokemon world. For example, it might use its song to heal, or accidentally put everyone to sleep at an inconvenient time.
One main element could be loneliness. Since Jigglypuff is often depicted as a cute and friendly Pokémon, it would be really sad if it was left alone. Maybe all its friends left for some reason, and it was left behind, feeling abandoned.
Another theme is competition in a friendly way. They might compete in things like a singing contest (even though Kirby doesn't really sing in the original game but it can be a fun concept in fanfiction) or a race, and through this competition, they learn more about each other and grow their friendship.
One possible storyline could be that Kirby and Jigglypuff are in a magical forest. They start as rivals, competing for the same delicious fruit. But as they interact more, they gradually develop feelings for each other. Their kiss could be a moment of realization of their new - found love, perhaps with a soft, warm glow surrounding them.
Sure. One popular Ash and Jigglypuff fanfiction is 'The Adventures of Ash and Jigglypuff'. It has an interesting plot where they go on a journey through different regions together, facing various challenges. Another one could be 'Ash and Jigglypuff's Bond', which focuses on how their friendship develops over time.
One idea could be a story where Jigglypuff and Kirby team up to save their shared world from an evil force. Maybe there's a dark wizard who is stealing all the food in their land, and Kirby's insatiable appetite and Jigglypuff's ability to put enemies to sleep work together to defeat the wizard. Another idea is a story about a singing competition between them. Jigglypuff is known for its singing, but Kirby might surprise everyone with a unique musical talent of his own. They could learn from each other and become great friends through this competition.
Jigglypuff is often seen as a bit more vain about its appearance and talent compared to Kirby. In fanfiction, this could create an interesting contrast. Kirby doesn't really seem to care much about such things. So, Kirby could be the one to make Jigglypuff realize that there are more important things than just looking good and having a great voice. This could lead to a deepening of their friendship as Jigglypuff grows as a character thanks to Kirby's influence.