Maybe they are both part of a secret organization. Rudolph with his special abilities (like his glowing nose) and Tony with his own skills (perhaps he's a tech genius or something). They are paired up on a mission that requires both of their unique talents. As they work together, they develop a deep bond that turns into a romantic relationship over time. This could involve lots of action scenes as well as some tender, emotional moments between them.
In a more comical plot, Rudolph could accidentally end up in Tony's city during the holidays. Tony, being a bit of a skeptic at first, doesn't believe Rudolph is a real reindeer with magic. But as Rudolph shows off his abilities, like flying around the city skyline, Tony becomes fascinated. They start to explore the city together, getting into all sorts of funny situations like trying to fit Rudolph into an elevator or Rudolph scaring the pigeons in the park. And through all these antics, they fall in love.
One idea could be that Rudolph and Tony are from different worlds. Rudolph is a magical being from a winter wonderland, and Tony is a regular human. They meet by chance, and Rudolph's magic starts to have an unexpected impact on Tony's life, leading to a series of adventures as they learn to co - exist and understand each other.
Well, it could be about Rudolph and Tony going on an adventure together. Maybe they explore a spooky old castle that has some hidden secrets. They might encounter other supernatural beings and have to work together to overcome challenges.
They could be best friends. Tony might be the first human to accept Rudolph for who he is, and Rudolph might see Tony as someone he can trust completely.
One good tony x rudolph fanfiction could be about their adventures in a magical forest. They might discover hidden treasures and face challenges together, strengthening their bond along the way.
Friendship is a very common theme. Since Tony and Rudolph are the main characters in this fanfiction concept, their bond and how they support each other through different situations is often explored.
Another option is FanFiction.net. It's one of the oldest and largest fanfiction platforms. Just use the search function and type in 'tony x rudolph' to see if there are any relevant stories.
Maybe the OC has a special power or ability that Rudolph needs. For example, the OC can sense when danger is near. They team up to protect Rudolph's vampire family from a group of hunters who have come to town. As they work together, a deeper bond forms between them.
I'm not sure specifically as there could be many different interpretations. It might be a story where Rudolph, perhaps a character with some special abilities or nature, has an encounter with Tony that involves biting. It could be a very creative and unique take on their relationship within the fanfiction world.
A possible plot could be that they both have a common goal. For example, they are both trying to solve the mystery of a disappearing stream. Shrignold with his knowledge of the natural elements and Tony with his sharp observational skills work together. Along the way, they have some disagreements but soon realize that by combining their strengths, they can get closer to the solution.
One plot idea could be that Tony Stark somehow travels to the wizarding world. He could use his technological knowledge to improve the wizarding devices. For example, he might make brooms fly faster with some kind of engine modification.
Perhaps Stark visits Wakanda to study their technology further. The Wakandans are initially wary but soon realize his good intentions. As he shares his knowledge too, a mutual respect and something like 'love' (again, admiration) grows. They might team up to face a common threat using both Stark's Iron Man tech and Wakanda's vibranium - based weapons.