Well, obviously the two main characters are the Doctor and Captain Jack. The Doctor, a time - traveling alien with a vast intellect and a love for saving the universe. And Captain Jack, a charming, immortal time agent who has his own set of skills and a rather flamboyant personality.
One idea could be a time - traveling adventure where the Doctor and Captain Jack team up to stop an alien threat that is disrupting the space - time continuum. They could visit different historical periods and use their unique skills to outwit the enemy.
In Captain Jack Sparrow fanfiction, Jack is a top character, no doubt. However, characters like Tia Dalma are also excellent. Her voodoo powers and mysterious nature make for great plot twists. Another good one is Will Turner. When he's included in fanfiction, his sense of honor and sword - fighting skills can lead to some great action - packed scenes, especially when paired with Jack's more roguish behavior.
Well, Jack might meet the 11th Doctor when there's a threat to the space-time continuum that requires their combined efforts to fix. Or it could be a chance encounter at a pivotal moment in history.
It's possible that Jack meets the 10th Doctor when they are both drawn to a mysterious energy source. Another scenario could be when they are brought together by a common enemy with a devious plan.
In many Doctor Who fanfictions, the relationship between Jack and the 11th Doctor can be complex. It could involve mutual respect and adventure, or there might be conflicts and resolutions as they navigate through different scenarios. It really depends on the creativity of the author.
Percy could potentially be a character from another story or franchise that the author decided to insert into the Captain Jack Sparrow fanfic world. He might be a heroic type, or perhaps a bit of a trickster, depending on how the author wants to write him.