One plotline could be Ron getting poisoned. This would send his friends on a quest to find the antidote. Along the way, they might face many obstacles and have to make difficult choices. It also gives a chance to explore Ron's relationships with other characters more deeply as they are all worried about his well - being and are willing to go to great lengths to save him.
Often, Ron might get hurt while exploring a dangerous place like an old wizarding ruin. His friends then have to find a way to get him out safely and also deal with any curses or traps that are activated by his injury. Sometimes, Ron can be hurt by a magical creature too, like a basilisk or a werewolf. This would lead to a race against time to find a cure and also deal with the threat of the creature.
There's often the sacrifice plotline. They might sacrifice their relationship with Hermione to save a large number of people. For instance, they learn that a dark wizard will spare many lives if they abandon Hermione. Also, the jealousy plotline can exist. If a new character becomes closer to Hermione and they feel left out, they might leave out of jealousy and a sense of not belonging in Hermione's new social circle.
A plotline could be that Ron betrays Harry's trust by sharing a secret with someone he shouldn't. Harry is initially furious but then realizes Ron was manipulated. Harry forgives Ron, and they work together to fix the mess caused by the shared secret. For example, if the secret was about a new spell they were developing, they have to stop the wrong people from using it.
In some fanfictions, Ron is put under Imperio to steal a powerful magical artifact. This creates a huge conflict as Harry and Hermione try to figure out why Ron would do such a thing without realizing he's cursed.
Another plot could involve how their friends, like Harry, react to the news. Harry might offer his support and share his own experiences of growing up without parents, vowing to be a great godfather. There could also be a sub - plot about how Hermione's pregnancy affects her studies or research in the magical field.
There's also 'When Ron Fell'. In this fanfic, Ron has a bad fall during a Quidditch match. It shows how the other players react, especially Harry and Hermione. They are by his side throughout his recovery, and the story is filled with a lot of touching moments that highlight their bond.
Friendship is a very common theme. Most fanfictions explore the deep bond between Harry and Ron, like how they are always there for each other through thick and thin. Another common theme is adventure. They often go on new adventures together, facing challenges and solving mysteries.
One common theme is Ron's self - discovery. In many fanfictions, Ron goes on a journey to find out more about himself, his abilities, and his place in the wizarding world. Another theme is friendship. Since Ron is such an important part of the trio, his relationships with Harry and Hermione are often explored in different ways. For example, how they handle arguments or how they support each other through tough times.
Another theme is emotional hurt. Such as Ron feeling left out or betrayed. This often leads to stories about his journey of self - discovery and how he heals his emotional wounds. For instance, if he feels betrayed by a friend, the story might be about how he learns to trust again.
A great plotline could be Hermione and Ron going on a magical journey to find a special charm or ingredient that is said to ensure the baby has a strong magical ability. It could be a dangerous quest that tests their relationship and their skills as wizards.
A plotline could be that Ron is killed in a magical accident during an experiment gone wrong. This accident might be related to some new, dangerous magic that he was trying to master. His death would shatter the trio. Harry would feel guilty because he might have been involved in the experiment in some way. Hermione would be grief - stricken and would pour herself into research to try and understand what went wrong. The fanfic could then explore how the wizarding community reacts to Ron's death, with some blaming Harry and Hermione, and others mourning the loss of a great wizard. It could also show how Harry and Hermione have to grow and become stronger individually to face the challenges that come their way after Ron's death.