One possible plot is that the Lion Guard discovers some strange energy signatures that seem out of place in their world. These turn out to be related to the Gokaigers' power sources. As they try to figure out what's going on, the Gokaigers also detect a disruption in the balance of their power. They meet up and find out that a powerful enemy is trying to harness the combined power of both the Gokaigers' ranger powers and the magic of the Lion Guard's world. So, they have to put aside their differences and work together. The Lion Guard can use their natural abilities like Simba's roar, while the Gokaigers can use their mecha and ranger attacks to battle this new threat.
The main characters would be a mix from both sides. From the Gokaigers, we would have Captain Marvelous, who is bold and adventurous. He would be a great counterpart to Kion from the Lion Guard. Kion, with his sense of responsibility and the power of the Roar, would be a central figure. Also, other members of the Gokaigers like Joe Gibken, who is more of a tech - savvy character, could interact with the Lion Guard in interesting ways. For instance, he could help the Lion Guard understand some strange technological threats using his knowledge, while the Lion Guard could teach the Gokaigers about the natural magic and powers in their world.
One idea could be a crossover with the Power Rangers. The Gokaigers could team up with the Rangers to fight a common enemy that threatens both their universes. Maybe they start off as rivals, not understanding each other's ways, but then learn to work together as they realize the scale of the threat.
One common theme is friendship. When different characters from various crossovers come together, they often have to learn to trust and be friends. For example, in a crossover with a different animal group, they must work together as friends to achieve a common goal.
The plot could be that Janja tries to steal food from Jasiri's territory. But during the theft, he accidentally causes a big rockslide that endangers both their groups. They then have to work together to stop the rockslide and save everyone. This shared experience makes them see each other in a different way and start to develop a bond.
For 'the lion guard crossover fanfiction', consider a crossover with 'Zootopia'. The Lion Guard could travel to Zootopia and be amazed by the different animals living together in a city. They might get involved in a mystery in Zootopia, like helping Judy Hopps solve a case that involves some of the African animals. This could lead to interesting interactions between the Lion Guard's more natural and wild ways and the civilized society of Zootopia.
Perhaps there's a magical event that brings Tarzan and the Lion King world together. A mysterious force could transport Tarzan to the Lion King's world. He would be a strange sight for the Pride Lands animals. Tarzan could bond with young Simba or Nala. They could go on adventures together, exploring new parts of the Pride Lands. Tarzan might also introduce some of his jungle friends like the elephants or monkeys to the Pride Lands, creating a unique cultural exchange between the two very different ecosystems.
Well, perhaps in this fanfiction, there could be a common enemy for both Balto and the Lion King characters. Let's say an evil group of hyenas from Balto's world team up with Scar's old followers. Balto and Simba would then have to work together, combining their leadership and survival skills. Balto's experience with the wilderness and Simba's knowledge of the Pride Lands would be a great combination to defeat this new threat.
How about including characters from Sailor Moon? It would be really interesting to see the Gokaigers interact with the Sailor Scouts. Maybe they could learn some new strategies from the Scouts' magic-based attacks.
The plot could revolve around a competition. There is a prize or a position of power up for grabs in the Pride Lands. Janja wants it for his own gain, while Jasiri wants it to protect the land. They initially compete against each other but then realize that there is an outside force that is trying to manipulate the situation. So, they join forces to defeat this common enemy and in the process, develop a new understanding of each other.
In the context of fanfiction, it might be a creative take on the original Lion Guard concept. The writer could be introducing a situation where three characters, whether they are main or side characters from the show, are given a special place, a 'throne', which might involve certain responsibilities, privileges, and challenges. This could lead to new storylines such as how they interact with other characters, how they handle their new position, and what kind of changes they bring to the overall Lion Guard world.