I'm not sure about specific fanfiction related to these characters without adult content. But you can try looking on some general 'yugioh' fanfiction websites like FanFiction.net. Search for stories with the characters' names and filter out any inappropriate ones.
Maybe a story where they discover an ancient 'yugioh' relic that has the power to change the rules of the game. They then have to work together to figure out how to control this relic and keep it from falling into the wrong hands. It could involve a lot of mystery and adventure as they explore the history behind the relic.
One of the main themes is love. It could be a romantic love or a deep platonic bond that forms between Marik and the oc. Also, power dynamics can be a theme. The oc might have a certain power or skill that changes the power balance between them and Marik. Another common theme is the struggle against inner demons. Marik has his own inner demons, and the oc may play a role in helping him face them.
A common theme is the exploration of their rivalry. They are both strong characters in Yu - Gi - Oh, and fanfictions often play with how their competitive natures interact. Another theme is the idea of redemption. Sometimes, they help each other move past their darker tendencies.
One popular 'yugioh bakura x marik fanfiction' is 'The Unlikely Bond'. It explores their complex relationship in a well - written way. Another is 'Shadows of Alliance' which delves deep into their shared experiences in the Yu - Gi - Oh universe.
A 'yugioh gay lemon fanfic' might be a work of fan fiction that combines elements of the Yu - Gi - Oh franchise with homosexual relationships (gay) and perhaps some more mature or romantic themes (lemon). However, such fanfics are often not part of the official Yu - Gi - Oh canon and are created by fans for fans who are interested in exploring alternative storylines and relationships within the Yu - Gi - Oh world.
I'm not aware of any specifically popular 'yugioh gay lemon fanfic' stories. This type of fanfic may not be as mainstream due to its combination of non - traditional relationship themes and potentially inappropriate content. Also, much of the Yu - Gi - Oh fan community may focus more on the official storylines, card battles, and canon relationships.
Common themes in Marik Ishtar lemon fanfiction often revolve around his relationship with other characters from the Yu - Gi - Oh! universe. For example, there could be themes of forbidden love, as Marik has a rather dark and complex character. His internal struggles between his good and evil sides can also be a central theme, with the lemon aspect adding a layer of intensity to his relationships, whether it's with a fellow duelist or someone else in the Yu - Gi - Oh! world.
One popular 'yugioh marik x oc fanfiction' is 'The Bond Beyond Dueling'. It explores a deep emotional connection between Marik and an original character. Another great one is 'Marik's New Path' which shows how an oc can influence Marik's journey in an interesting way.
In general, lemon fanfictions are a bit controversial in the Yugioh fandom. While some fans might enjoy exploring romantic and more adult - themed relationships in fan - created works, others feel that it goes against the family - friendly nature of the Yugioh series. It really depends on different individuals' views and the specific community guidelines of different fan groups.