To develop Tyki Mikk's personality in the story, you could focus on his hedonistic side. He enjoys the pleasures of life, so show how this affects his decisions and interactions with Allen. Maybe he tempts Allen with the allure of a more carefree life. For Allen Walker, his self - sacrificing nature can be developed further. He always puts others first, but in the fanfiction, this could lead to some internal conflict when it comes to Tyki. He might wonder if he should save Tyki or let him be because of his Noah nature. Also, Tyki's sense of loyalty, which is split between his Noah comrades and his newfound connection with Allen, can be a great area for character development. And Allen's ability to forgive and his moral compass can be tested and refined through his relationship with Tyki.
Well, a possible plot for a Tyki Mikk x Allen Walker fanfiction could involve a situation where Tyki is injured and Allen has to take care of him. This could lead to a lot of tense moments as Allen is not sure if he can trust Tyki, but at the same time, he can't just let him die. Also, a plot could revolve around them being captured by a common enemy and having to work together to escape. Or perhaps a story where they both get transported to a different dimension and have to rely on each other to find their way back while also dealing with their own personal demons.
The character dynamics are often complex. Tyki Mikk, as a Noah, represents chaos and the side against the Order that Allen Walker is part of. But they can also find common ground in their shared humanity. For example, they might both enjoy simple pleasures like a good meal or a beautiful sunset, which can create a momentary truce between them.
One plot idea could be a story where Tyki Mikk and Allen Walker are forced to team up against a common enemy greater than their differences. Maybe a new, extremely powerful Akuma that threatens to destroy both the Order and the Noah's side. This would put them in a situation where they have to rely on each other's unique abilities.
Love and acceptance are also prevalent themes. The OC may come to love Tyki Mikk despite his flaws, and Tyki Mikk may learn to accept the OC's presence and the feelings that come with it. Also, power dynamics can be a theme. The OC might have their own power or lack of it compared to Tyki Mikk, and how they navigate that relationship in terms of power is often explored.
One great Tyki Mikk x OC fanfic is 'A Meeting of Souls'. It delves deep into the relationship between Tyki and the original character. The author does an amazing job of creating a believable backstory for the OC that ties in well with Tyki's own story in the original work. It has some really sweet moments of interaction between them.
First, you need to understand Tyki Mikk's character well. Read the original material to get a sense of his personality, his motives, and his backstory. Then, create an OC that can complement or contrast with him in an interesting way. For example, if Tyki is mysterious, the OC could be very straightforward.
There's also 'Love Beyond Darkness' which is a Tyki Mikk x OC fanfiction. The OC is portrayed as a strong - willed character who challenges Tyki Mikk in different situations, and their relationship evolves in a very engaging way throughout the story.
Love is a very common theme. It could be a slow - burning love or a love at first sight between the reader and Allen. Another common theme is adventure, as Allen is often involved in dangerous and exciting situations, and the reader gets to be part of those. Also, friendship is a theme, as the relationship might start as friends and then develop into something more.
One common theme is the struggle between duty and love. They both have important roles in the Black Order, so many fanfictions explore how they balance their responsibilities with their growing feelings for each other.