Another plotline might involve Wanda being manipulated by an enemy. She is made to believe that Tony is a threat and so she attacks him. This then sets off a chain of events where they both have to come to terms with what has happened, whether it's forgiveness or further conflict as they try to figure out who is really behind the manipulation.
Maybe in some 'wanda hurts tony fanfiction', it's more of an emotional hurt. Wanda could accidentally reveal some of Tony's deepest secrets or traumas, causing him mental anguish. This could lead to a rift between them and the other Avengers having to deal with the fallout.
Perhaps Pepper, in an attempt to protect Tony from himself, takes extreme measures. For example, she could sell off Stark Industries' technology that Tony was using for his Iron Man suits without his consent. This would be a huge betrayal in Tony's eyes as his technology and the Iron Man identity are so closely tied to him. It could lead to a rift between them that is difficult to mend as Tony feels violated and Pepper believes she was doing the right thing to keep him safe.
I'm not sure of specific 'wanda hurts tony fanfiction' stories off - hand. You could try searching on popular fanfiction websites like Archive of Our Own. They have a vast collection and you might be able to find some stories with that theme by using their search function.
Since I'm not sure about specific 'One Piece Wanda Lemon' fanfiction, but generally in One Piece fanfiction, a plotline could involve new adventures for the Straw Hat crew. Maybe Wanda is a new character who has some special abilities and joins the crew on a quest to find a new treasure. Or perhaps she has a connection to an existing villain in the One Piece world and the story unfolds around that conflict.
One possible plotline could be Tony as a panther facing off against some kind of threat to his territory. Maybe there are other supernatural creatures trying to encroach on his space.
One possible plotline could be that Lila spreads false rumors about Marinette at school, causing Marinette's friends to doubt her at first. For example, Lila might say Marinette stole something from her, which makes everyone look at Marinette suspiciously.
Another plotline could be based on a misunderstanding. There could be some false information spread about Elizabeth that makes Meliodas believe she has betrayed him or the group. So, in his anger and disappointment, he hurts her. For instance, if he hears that she's made a deal with an enemy, without getting all the facts straight, he might confront her harshly and his actions could cause her emotional or physical pain. But then, as the truth comes out, he has to deal with the guilt of what he's done.
One possible plotline could be that Alucard's actions towards Seras are a result of his complex nature and his struggle with his own vampiric instincts. Maybe he accidentally hurts her during a training session that gets out of hand.
It could be that Rachel criticizes Kurt's fashion choices in a very public and mean - spirited way in the glee club. Since fashion is an important part of Kurt's identity, this could deeply wound him and create a hostile environment between them until they both learn to respect each other's differences.
One possible plotline could be that Bernardo gets into a dangerous situation, like being trapped in a burning building, and Tony risks his life to save him. Maybe there's a feud between their groups, but Tony's sense of justice or his personal feelings for Bernardo override that.
One possible plotline could be that Mantis and Tony meet during a battle and Mantis uses her empathic abilities to understand Tony better than anyone else. This could lead to a deep friendship or even a romantic relationship.