It's possible that they decide to take their relationship to the next level. In the Danny Phantom fanfiction world, after numerous dates, they could consider revealing their relationship to their families and friends. This could bring a whole new set of storylines, like dealing with Sam's overprotective parents or Danny's ghost - hunting friends' reactions.
The relationship could develop into a more trusting one. After so many dates, they've shared a lot, and there's a stronger bond of trust. For instance, Danny may trust Sam enough to show her a new power he's discovered.
He could be in a situation where he's trapped in the Ghost Zone. His friends might have to figure out a way to get to him. They could use some of Tucker's new inventions, like a Ghost Zone - traversing vehicle. They'd face many challenges along the way, such as avoiding other dangerous ghosts.
She could face a lot of challenges. For example, she might be shunned by some in the ghost world because of her half - human heritage from Danny. Or she could struggle to fit in with humans because of her ghostly powers. It would be a complex situation for her to navigate.
Well, in such a fanfiction, Danny Phantom might be in a really tough situation. Walker is a powerful foe. He could be locked up in Walker's prison dimension, facing all kinds of strange and dangerous inmates. Maybe he'd be trying to find a way to escape using his ghost powers, but Walker has probably set up all sorts of barriers to prevent that.
In the fanfiction, Danny might be in the hospital because of his ghost - fighting injuries. Maybe he has to hide his ghost powers from the doctors while trying to recover.
In a Danny Phantom fanfiction involving Valerie and Nathan, they could become allies in the fight against ghosts. Maybe Nathan discovers Valerie's secret identity and offers his technological expertise to help her upgrade her ghost - hunting gear. This would make them a formidable team, taking on powerful ghosts that Danny might have trouble with on his own.
Well, in the 'Danny Phantom becomes colder' fanfiction, it could be that Danny's connection to the Ghost Zone is somehow altered. This alteration makes him colder in nature. His ectoplasmic energy could be affected, causing his body to emit a cold aura. His relationships might also suffer. Sam and Tucker may initially be confused by his sudden change in behavior. They might think he's pushing them away on purpose. Danny, on the other hand, could be struggling with this new coldness inside him, not fully understanding what's happening. He might try to isolate himself to protect others from this strange new aspect of himself, which would add a layer of emotional drama to the story.
Perhaps the Avengers are initially skeptical of Danny's abilities, thinking he's just some kid. But then Danny shows them what he can do, like his ghostly wail which could be a powerful weapon against their foes. They might then start to respect him and work together as a team. Danny could also learn a thing or two from the Avengers about teamwork and strategy.
Danny might use his powers to cheat in gym class without getting caught. For instance, he could use his super strength to win a weight - lifting competition or his flight to win a race. But he has to be careful not to arouse suspicion among his classmates.
In a Danny Phantom fanfiction where Sam gets hurt, Danny might go into a rage. He'd use his ghost powers to find out who was responsible and protect her at all costs. Maybe he'd have to face a new, more powerful ghost that targeted Sam because of her connection to Danny.