In a 'chara vs gaster fanfic', if the victory is determined by who has the stronger will, it could be a long - drawn - out battle. Chara has a strong will born out of their experiences, but Gaster's will might be equally strong considering his enigmatic nature and whatever his goals are in the story. It's really up to the creativity of the writer to decide who emerges victorious.
Well, one interesting plot point could be the clash of their different personalities. Chara is often seen as complex and morally ambiguous, while Gaster has his own mysterious aura. Their encounter might lead to intense power struggles, like battles over control or influence within the story's universe.
When writing an 'oc vs chara fanfic', it's crucial to give both characters depth. Start with their backstories. Maybe the chara has a tragic past that led to their current beliefs, and the oc has a different upbringing that shapes their perspective. Next, create a situation where they are forced to interact. It could be a competition or a shared mission gone wrong. Use dialogue effectively to show their differences. For example, the chara might be bold and direct in their speech, while the oc is more reserved and thoughtful. As the story progresses, let their relationship evolve in unexpected ways. This will keep the readers on their toes and make for an engaging fanfic.
There is also 'The Struggle for Recognition'. This 'oc vs chara fanfic' focuses on how the oc tries to prove themselves in a world dominated by the chara. It delves deep into the insecurities of the oc and how they overcome them while facing the chara. The story also explores the power dynamics between the two and how they change throughout the narrative.
Toge Inumaki is important too. His special cursed speech ability makes him stand out. Also, the principal of the school, Masamichi Yaga, is likely to be important as he is in a position of authority and has an influence on Gojo and the other students. There could be other characters like the members of different clans that also play roles in the complex web of the story.