The plot might revolve around an ancient artifact that has the power to either save or destroy the Origin System. Oberon and Trinity hear about it and decide to find it first. They face off against other Warframes who also want the artifact. During their journey, they discover new things about themselves and each other. Trinity realizes that Oberon has a softer side, and Oberon sees Trinity's determination. They eventually find the artifact and must make a difficult decision about what to do with it.
A possible plot could be that Oberon and Trinity are sent on a secret mission to infiltrate a hidden Grineer base. Oberon uses his abilities to create distractions while Trinity sneaks in to retrieve some important data. They then have to fight their way out together, relying on each other's combat skills.
In a fanfiction, the plot could be centered around a powerful Orokin device that has been awakened. Oberon and Trinity are the only ones who can stop it from causing havoc. They start by researching about the device in the various relays. Then they journey to the location where the device is. Along the way, they encounter different types of enemies and obstacles. Trinity heals Oberon when he gets injured, and Oberon uses his powers to clear paths. Once they reach the device, they have to combine their powers in an unexpected way to deactivate it, and in the process, their bond as friends and partners becomes even stronger.
There could be a fanfiction where Oberon and Trinity team up for a mission on a desolate planet. Maybe they have to face a new and powerful enemy faction. Oberon's nature - based powers and Trinity's healing and energy - based abilities would make for an interesting combination. They could start off as just comrades in arms, but as the story progresses, a deeper bond of friendship might develop between them.
Another idea for the fanfic could be a story set in a post - apocalyptic part of the Warframe world. Oberon and Titania are two of the few remaining Warframes in that area. They have to rely on each other not only for survival but also to try and rebuild what has been lost. Titania could use her nature - based powers to start to regrow plants and bring some life back to the desolate land, while Oberon protects her from the remaining hostile forces.
One plot could be a competition between them. They could have a friendly wager on who can complete a certain mission the fastest. This could show off their different skills and abilities in a fun way.
It could be a story of love and growth. Arata starts off as a bit of a novice in the magical world, and Levi, being more experienced, takes him under her wing. As they spend more time together, feelings develop between them, and at the same time, Arata becomes more powerful and confident in his magic abilities. They face challenges from other characters who oppose their relationship or their growing influence in the magical community.
In the 'Harry Potter and Oberon are mates fanfiction', the plot could be centered around the cultural and magical differences between wizards and fairies. Oberon, being Harry's mate, has to introduce Harry to the fairy society. Harry, in turn, has to deal with the prejudice from some fairies who don't trust wizards. Meanwhile, they both work together to solve a mystery that threatens both the wizarding world and the fairy realm, such as a dark force that is trying to break down the barriers between the two worlds.
The plot might revolve around a conflict where Harry's descent from Oberon makes him a target. Voldemort could want to use his unique heritage for his own dark purposes. Harry then has to navigate this new threat while also learning about his fae heritage, which includes things like learning new spells or magic related to Oberon's lineage.
The plot could involve the Operator getting lost in a strange dimension, and Mirage being the only one who can sense where they are. Mirage then embarks on a journey to rescue the Operator. Along the way, she has to face her own fears and insecurities as she battles through various enemies and obstacles. When she finally finds the Operator, they both realize how much they rely on each other.
In a fanfiction, the plot could involve Valkyr and Rhino being trapped in an Orokin Void tile set. They have to find a way out while being hunted by the Sentients. Valkyr's Hysteria ability could be crucial in fending off the Sentients' initial attacks. Rhino, on the other hand, could use his Iron Skin to protect Valkyr when she is vulnerable after using Hysteria. As they explore the Void, they discover secrets about the Orokin and their past experiments. This knowledge could be used to find an exit and also strengthen their bond as they realize they are both part of a bigger mystery within the Warframe universe.
One idea could be an operator who has lost their connection to the Warframes and must go on a journey to rediscover it. They could encounter various Warframes along the way that are in distress or have gone rogue, and the operator has to use their wits and limited powers to help them. Another plot could involve an operator falling in love with a sentient being, which causes a great rift among the Tenno community as they see sentients as enemies. A third idea is that the operator discovers a hidden power within themselves that can enhance the abilities of all Warframes, but at a great personal cost.
One interesting story could be about an operator who forms a deep bond with their Warframe during a difficult mission. The operator discovers new abilities of the Warframe that were previously unknown, and together they overcome a powerful enemy. For example, the operator might find that their Rhino Warframe can perform a special charge move in a particular situation that saves them from a horde of enemies.