His best friend Gerald would be a great character to assist Arnold. Gerald is often shown as confident and street - smart. He could use his charm and knowledge of the neighborhood to help Arnold out of whatever trouble he's in. For example, if Arnold is lost in a new part of town, Gerald could easily find their way back.
One possible plot could be that Arnold is facing some kind of academic trouble. Maybe he's struggling with a difficult subject at school like advanced math or a complex science project. His friends could then come together to try and help him out. They might organize study sessions or find a tutor for him within their group.
One idea could be that the werewolf child is in a human village and is being hunted. A kind-hearted human could find the child and hide it, learning about the child's unique situation and trying to find a way to protect it from both the villagers and the werewolf pack that might be looking for the child.
The werewolf child could be found by a wizard. The wizard, seeing the potential in the child, could offer to teach it magic to control its werewolf side. This would be a unique opportunity for the child to gain some power over its own nature and also protect itself from those who might want to harm it because of what it is.
Love is a very common theme. Given Helga's long - hidden love for Arnold in the original series, fanfics often expand on that, showing how they navigate their feelings as they grow older.
Well, 'Hey Arnold!' fanfics can be really interesting. A 'Roadside Girl' themed one might focus on a new character, a girl by the roadside who gets involved in Arnold's adventures. It could add a fresh perspective to the story, perhaps showing how Arnold and his friends interact with this new element in their neighborhood.
Love and friendship are common themes. Their complex relationship, with Helga secretly loving Arnold while they also have a sort of friendship, is often explored.
A possible plot could be that Arnold has a really bad day. First, he fails a big test at school, then he loses his favorite hat, and on top of that, his grandparents forget his birthday. All these disappointments pile up and he just snaps. He starts being mean to everyone, including his best friend Gerald. As the fanfic progresses, his friends could try to figure out what's wrong with him and help him through his tough time.
The magical creatures could play a role in helping Harry. For example, the centaurs with their deep understanding of the stars and magic could offer their wisdom. The house - elves, like Dobby (if he's alive in the fanfic), might use their unique magic to assist Harry in a time of need.
In a 'Naruto Needs Help' fanfiction, Naruto could get help from unexpected sources. The tailed beasts themselves could come to his aid. Since Naruto has a connection with Kurama, the other tailed beasts might sense his distress and offer their power. Also, characters from other villages. For example, Killer Bee could teach Naruto some new techniques related to the tailed beasts' power, or Temari could use her wind techniques to assist in a battle where Naruto is outnumbered.