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.
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.
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.
The fanfic could be set in a post - war scenario. Nidus and Saryn are part of a group trying to rebuild the war - torn areas of the Origin System. Nidus is using his powers to purify and transform the infested areas into something more habitable, while Saryn is using her toxins to destroy any remaining harmful substances. At first, the other members of the group are a bit wary of their powers. But Nidus and Saryn prove their worth. They also start to develop a special connection as they work side by side, with Nidus being intrigued by Saryn's scientific approach to her powers and Saryn being fascinated by Nidus's biological mutations.
Well, it could be about the JoJo characters getting transported into the Warframe universe. They might team up with the Tenno to fight against common enemies like the Infested. For example, Jotaro could use Star Platinum's power along with a Warframe's abilities to take on hordes of foes.
Titania in these stories is often very kind. She uses her magic to help others, like animals or lost children.
One possible plot could be that the Tenno from Warframe are somehow transported to the Star Wars universe. They could team up with the Jedi to fight against the Sith and the Grineer, who have also found their way into this new universe. The Tenno's unique abilities, like their Warframe powers and weaponry, would be a great addition to the Star Wars battles.
One common theme could be the exploration of their relationship dynamics. Since it's a fanfic, the writers might focus on how they interact, whether it's a love - hate relationship or a slow - burn romance.
I would say Mag. Mag has abilities that are very useful for story missions. Her Pull ability can draw enemies towards her or pull items from a distance. This can be used to disarm enemies or gather resources easily. Her Crush ability can deal a good amount of damage to grouped - up enemies, which often happens in story battles.
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.