First, give the MC a clear backstory. For example, if they are a human, explain where they come from, their family, and what led them to get involved with the events related to Cell. Maybe they were training in martial arts because they had a personal vendetta against powerful beings after their family was killed by a random villain. This would give them a motivation to face Cell.
One idea could be that the MC is a scientist who was involved in Cell's creation and now has to face the consequences. Maybe they try to find a way to stop Cell's rampage by using their knowledge of his genetic makeup.
A common theme is power. Since Cell is a powerful character in DBZ, often in 'cell x oc dbz fanfic', the OC might be on a journey to gain power or deal with Cell's power. Another theme is redemption. Sometimes the fanfic might explore Cell's character in a way that gives him a chance at redemption through his relationship with the OC.
One possible fanfic could be about Goku's intense training before the Cell Games. He might be shown pushing his limits in the Hyperbolic Time Chamber, trying out new techniques and forms to defeat Cell. Maybe he discovers a new power level that no one, including himself, expected.
Well, one way to find good 'cell x oc dbz fanfic' is to check out popular fanfic websites like FanFiction.net or Archive of Our Own. Just search for the 'cell x oc dbz' tag and browse through the results. Some might have really interesting takes on the relationship between Cell and an original character in the Dragon Ball Z universe.
The concept of 'cell drain tail' in dbz fanfic might bring together some interesting elements. The tail, being a unique part of Saiyan biology, could be the target or source of the cell drain. It could be that the cell drain is a result of some new form of bio - engineering or alien technology. There might be a focus on the physical and emotional changes the characters go through. For example, if a Saiyan's tail is being drained at the cellular level, it could cause them pain, weakness, or even strange mutations. And this could lead to new story arcs where the character has to find a way to reverse the process or use it to their advantage in some way.
One possible plot could be that the mc (main character) discovers a strange cell that has some sort of connection to a powerful db (database). Maybe this cell holds the key to unlocking some hidden knowledge or power within the database. The mc then has to go on a journey to figure out how to access and use this knowledge or power without falling into the wrong hands.
I'm not entirely sure specifically what a '707 x mc fanfic' is about without more context. It could potentially be a fan - created story about a character named 707 and a main character (mc) from a particular fandom. It might involve their relationship, adventures they go on together, or some sort of emotional journey.
One idea could be that the OC is a powerful being from another dimension and Cell is intrigued by their power. He tries to either absorb them or form an alliance to take over the universe together. Another plot could be the OC has a special ability to control Cell's cells, creating an interesting power dynamic between them. And a third could be that the OC is a time - traveler who knows Cell's future and tries to change his path in the DBZ universe.
Well, in such a fanfic, the character dynamics are key. Saeyoung is often portrayed as a fun - loving yet complex character. MC, being the central figure in relation to both Saeyoung and Saeran, can bring out different sides of them. Saeran, on the other hand, may have his own insecurities and desires. The fanfic could play with these elements, creating stories of growth, acceptance, and perhaps even redemption for the characters. It's all about how the writer weaves the relationships between these three.