It can make characters act out of character. For example, a usually calm and collected ninja might become reckless when in love. They could take unnecessary risks to protect their loved one or to prove their love. This can put them in danger and also affect their reputation among their peers.
Sometimes, in Naruto fanfiction, love can bring trouble when it involves a love triangle with a powerful and unpredictable character. For instance, if Orochimaru gets involved in a love triangle between two young ninjas. His motives are always suspect, and his presence can create chaos. The two ninjas in love might find themselves in dangerous situations as they try to deal with Orochimaru's interference while also dealing with their feelings for each other.
Another possibility is that Hinata could be the main love interest. Naruto and Hinata had a relationship that developed over time in the original Naruto story. In this fanfiction, their love could be filled with more crazy and troublesome situations, like family objections or some new enemy targeting their relationship.
Perhaps in this 'naruto crazy trouble with love fanfiction', Naruto is in love with a character who has a really difficult past. Their relationship is full of trouble because of her past traumas and secrets. Naruto has to be really patient and understanding, and they get into all kinds of crazy adventures together as they try to work through their issues.
Well, it could be that Peter falls in love with someone he shouldn't, like a villain's daughter perhaps. This would lead to all sorts of crazy trouble as his friends and the city he protects might not accept it.
Most likely Ben would be one of the main characters. Since it's a Ben 10 fanfiction, he's usually at the center of things. And if it's about love, perhaps his love interest, whoever that may be in this story, would also be a main character. Maybe Gwen could also play an important role, either as a friend giving advice or getting involved in some way in the love - related drama.
Well, it could be about all kinds of crazy things that happen when love is involved in the Ben 10 universe. Maybe it's about a character falling in love with an alien they meet during their adventures. Or perhaps it's about the troubles that come with having a relationship while also being a hero and having to deal with all the alien threats.
Perhaps Peter realizes that his superhero responsibilities are more important at the moment and decides to put his love life on hold. By focusing on being a hero, he might find that the 'crazy trouble with love' slowly fades away as he has less time to get into relationship drama.
One common theme is miscommunication. Ash often misunderstands the feelings of others or vice versa, which leads to all sorts of trouble in the love department.
Develop your characters' emotions deeply. Since it's about 'love' and 'crazy trouble', show how the characters grow and change because of their relationships. Use vivid descriptions to bring out the Avatar setting. For example, describe how the air temple looks when the two lovers meet there during a storm, which represents the 'crazy trouble' they are in. Also, don't be afraid to introduce new elements that fit within the Avatar universe.