In many fanfictions, James is depicted as a natural leader. He might be the one to initiate most of the plans and actions. Teddy is the one who thinks things through more carefully. He uses his experiences to guide James. For instance, when they are in a tricky situation, Teddy will consider all the possible outcomes before acting, while James might just jump right in.
James is often shown as a brave and sometimes a bit reckless, just like his father. He's full of energy and always ready for an adventure. Teddy, on the other hand, is more mature. He has a kind heart but also a sense of responsibility, having grown up without his parents.
There might be a fanfiction where they go on a journey outside of Hogwarts. They encounter magical creatures and face challenges that test their friendship. For example, they might have to deal with a group of dark wizards who are after a powerful magical artifact.
James might be really excited. He's heard stories about his father's friends, and Teddy is like a link to that past. He'd probably be full of questions about the Marauders and what his dad was like as a student. Lily, on the other hand, would be more reserved but still interested. She might be a bit more empathetic towards Teddy, considering his difficult past. Overall, they'd both be curious and eager to learn more from him.
One possibility could be that Teddy is visiting Hogwarts for some event, perhaps a special anniversary celebration. James and Lily, being students at Hogwarts, cross paths with Teddy. Teddy, being the son of Remus Lupin and having a connection to their family through Harry Potter (James and Lily's son), might share some interesting stories about their parents' time at Hogwarts. Maybe he tells them about the Marauders and how their father and his friends were quite the mischief - makers. It could be a heartwarming encounter where James and Lily get to see a different side of their family's history through Teddy.
In fanfiction, James Sirius Potter's birth is often depicted with a lot of excitement and anticipation. Writers might describe the Potter family's joy, and perhaps the presence of friends like the Weasleys during this special time.
One popular type of fanfiction about James Sirius Potter might be his adventures at Hogwarts. Writers could explore his relationships with his friends and family, like how he deals with the legacy of his famous father, Harry Potter. Maybe he gets into some mischief in the same way his father did, but also has to face new challenges specific to his own time at the school.
It could be one of his professors. If Teddy was constantly late to class or not doing his homework, a strict professor like Professor McGonagall might send a Howler to set him straight.
In some Harry Potter fanfictions about Teddy Lupin's time travel, he might go back to prevent certain tragedies. For example, he could try to save his father Remus Lupin from the final battle. He might use his knowledge of the future to change the course of events, perhaps by warning the Order of Phoenix earlier about Voldemort's plans.
Well, perhaps in the fanfiction, Harry adopts Teddy Lupin right after the Battle of Hogwarts. Teddy is just a baby then. Harry, who has lost so many people, sees Teddy as a new beginning. He might face challenges from the wizarding community as some may question his ability to raise Teddy. But Harry, with the help of his friends like Hermione and Ron, overcomes these difficulties and Teddy grows up to be a strong and kind wizard.
Their relationship could start as a simple acquaintance at Hogwarts. As they participate in school activities like Quidditch matches or wizard duels, they gradually become friends. Then, as they grow older, they might realize they have deeper feelings for each other.
His father, Harry Potter, might also send a Howler. Harry knows the importance of discipline and responsibility, and if James was shirking his duties or not following the rules at Hogwarts, Harry would not hesitate to use a Howler to communicate his disappointment and expectations.