In this kind of fanfiction, it would be a really interesting twist. Ash usually starts with Pikachu, but having Gengar as a starter would change a lot of the story dynamics. Gengar is a Ghost/Poison type, which is much different from Pikachu's Electric type. This could lead to different battle strategies and interactions with other trainers. For example, Gengar's ability to phase through walls and its spooky nature could add a whole new element to Ash's journey. Maybe he would face more challenges against trainers who are used to dealing with the typical starter Pokémon types like Fire, Water, and Grass.
In this fanfiction plot, Gengar could be the key to unlocking a hidden world of Pokémon. Since it's a Ghost - type, it might have a connection to a dimension that other Pokémon and trainers don't know about. Ash, with Gengar by his side, could explore this new world, meet new and strange Pokémon, and learn new battle techniques. Along the way, they would face challenges from other trainers who are jealous of Ash's discovery. The story could build up to a big battle where Ash and Gengar use their new - found knowledge and skills to defeat a powerful enemy and become heroes in the Pokémon world.
In some fanfictions, when Gengar gets captured by Ash, it might lead to some really interesting team dynamics. Ash could use Gengar's unique abilities in battles. For example, Gengar's ability to phase through walls could be used in creative ways during gym battles or against Team Rocket. Maybe Gengar would initially be a bit rebellious, but over time, it would grow to respect Ash as its trainer. Ash would also have to find new ways to train Gengar compared to his other Pokémon, since Gengar has different strengths and weaknesses.
Well, if it's 'Ash gets a different starter fanfiction', perhaps he gets a Bulbasaur as his starter. This would lead to him being more involved in grass - type Pokémon battles and strategies. He could end up exploring different regions in search of rare grass - type Pokémon to strengthen his team. Also, his personality might develop in a different way, as Bulbasaur has a calmer and more patient nature compared to some other starters, which could influence Ash's own temperament over time.
The story could develop in many ways. For one, Ash might enter new tournaments with Gengar by his side. Gengar's presence could attract the attention of other trainers who are either scared or intrigued. This could lead to some unique battles where Ash has to prove that he can handle Gengar well. Also, Gengar might have some secrets or a past that gets revealed as it spends more time with Ash. Maybe it was once part of an evil team but now has a chance to be good with Ash as its trainer.
In the 'Ash gets a female Pikachu as a starter fanfiction', one possibility is that the female Pikachu could form special bonds with other Pokémon. Since female Pokémon often have different social behaviors, she could befriend different types of Pokémon more easily. This would open up new storylines for Ash, like being able to access areas or get help from Pokémon that he otherwise wouldn't have. Also, she might be more attracted to certain types of Pokéballs or items, which could also add interesting twists to the story.
It could be a trainer who has a starter that has a type advantage over Ash's new starter. For example, if Ash has a Squirtle and the antagonist has an electric - type starter like Pikachu, they would constantly be in conflict. The antagonist might be jealous of Ash's skills or the potential of his Squirtle and try to undermine him at every turn.
Well, if Ash gets Darkrai as a starter, he would have a really powerful Pokémon right from the start. Darkrai is known for its ability to induce nightmares and has strong dark - type moves. Ash could use it to quickly gain an edge in battles against other trainers. Maybe he would face some challenges too, like dealing with people who are afraid of Darkrai because of its spooky reputation.
One possible scenario in this fanfiction could be that Ash's journey takes a completely different turn with Latios as his starter. Latios, being a powerful and intelligent Pokémon, might help Ash quickly gain a reputation in the Pokémon world. They could form a unique bond, different from what Ash has had with his other Pokémon in the original series. Ash could use Latios' speed and psychic abilities to his advantage in battles, making him a formidable trainer right from the start.
One common theme is friendship. Ash and Gengar form a strong bond in many fanfictions, like in stories where they help each other through tough battles or difficult situations.