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.
It might also feature a new character as Naruto's love interest. This new character could bring a whole new set of problems and crazy situations into Naruto's life. Maybe she's from a different dimension or has some unique powers that make their relationship really complicated and full of trouble.
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.
Gray could also be a part of it. He might be the one teasing Natsu about his love problems or even getting involved in some sort of love triangle situation with Natsu. And Erza, she could be the voice of reason, trying to get Natsu to sort out his feelings in a more proper way, while also dealing with her own reactions to Natsu's love - crazed antics.
I'm not sure specifically as the title doesn't give clear indication of the characters. It could be original characters created by the fanfic author. Maybe it's a story about a young couple who are the main focus of the 'trouble with love' part.
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.
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.
I'm not sure specifically as the name doesn't give away the characters directly. But typically in a love novel, there would be the two lovers at the center. Maybe a male and a female character who are from different backgrounds or have different personalities.
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.
As I haven't had the chance to read 'Trouble Boy Love Story', it's difficult to say who the main characters are. But it's likely to have the trouble boy as one of the main characters, and perhaps the person he falls in love with, like a girl who might be his opposite in some ways, for example, very calm and stable while he is all in chaos.
Without reading the 'Crazy Love' novel, it's hard to say exactly who the main characters are. However, they could be characters with strong personalities. Maybe there's a bold and adventurous character who falls for someone more reserved. The interactions between these two contrasting personalities could be the core of the story. It could also be that there are family members involved, and their opinions and actions influence the love story between the main characters.