In this fanfiction, perhaps they could have an epic battle against a common enemy. Jotaro with his Star Platinum and Jonathan with his Hamon could combine their powers in a unique way.
DIO could be a likely villain. Since he has a long - standing feud with the Joestar family. He might try to take advantage of the situation where Jotaro and Jonathan meet to cause chaos and try to defeat them both.
Well, they might have an epic showdown at first. Jotaro with his Star Platinum and McCree with his Peacekeeper. But then they could realize they have a common enemy and team up. Maybe they'd exchange stories about their different worlds.
A plot twist might be that Jotaro loses his Stand abilities temporarily and McCree has to protect him. Or perhaps they find out that there's a traitor among the people they thought were their allies in this fanfiction world. This would force them to re - evaluate their situation and who they can trust. Also, it could be that a powerful artifact they were supposed to protect actually has the power to control them, and they have to fight against its influence.
He could meet his past allies in a different context. For instance, he might encounter Kakyoin or Polnareff when they were just starting their journey. Maybe he could also run into Dio at a time when Dio was still plotting his rise to power, which would create a very tense situation.
Well, 'Jotaro's Redemption' is an interesting jotaro fanfic. It shows Jotaro dealing with the consequences of his past actions and trying to make amends. 'Jotaro in the Parallel World' is also quite cool. In this fanfic, Jotaro is transported to a parallel universe where things are very different from his own world. He has to adapt and find his way back. Then there's 'The Secret of Jotaro' which uncovers some hidden aspects of his character.
Once upon a time, Jotaro was on a long journey. He had been traveling all day, fighting off strange creatures with his Stand. As the night fell, he found a small, cozy cave. He made a fire using some dry branches. Then, he sat down and started to think about his friends and family. The warmth of the fire made him drowsy. Slowly, he lay down, using his hat as a pillow. With the sound of the crackling fire and the wind outside, Jotaro drifted off to sleep, ready for whatever new adventures awaited him in the morning.
Jotaro was in a forest. It was getting dark. He used his Stand to find a safe place to rest. He found a large tree with a hollow at its base. He crawled inside and made himself comfortable. He thought about all the times he had been in dangerous situations. But here, in this quiet forest hollow, he felt at peace. The sounds of the forest at night, the hooting of owls and the rustling of leaves, were like a lullaby to him. He closed his eyes and soon was fast asleep, his Stand standing guard over him even in his dreams.
One common theme is romance. Writers often explore Jotaro's relationships with female characters, whether it's a slow - burn love story or a more sudden attraction. Another theme could be adventure. Since Jotaro is known for his action - packed adventures, fanfictions might include female characters joining him on his quests.