One common theme is self - discovery. The OC time lords often have to figure out their place in the universe and their unique abilities.
A third common theme is redemption. Sometimes the OC time lords have made mistakes in their past, and the fanfic focuses on them trying to atone for those errors and become better beings. This can involve making sacrifices and facing difficult challenges along the way. In some cases, they might have to face the consequences of their actions in a very personal way, like losing friends or loved ones because of their past mistakes.
One common theme is changing the outcome of the original Twilight story. For example, an OC might time - travel to save a character who died in the original plot.
One common theme might be mystery and intrigue. The Hellfire Club often has an air of secrecy, and when combined with a lord imperial character, there could be all sorts of hidden agendas, plots, and things that the characters are trying to uncover. Also, social hierarchy is likely to be a theme. There are different levels of power and status within the club and in relation to the lord imperial, and this can create a lot of interesting storylines about climbing the ladder or trying to break free from it.
One common theme could be exploration. Since Time Lords are known for traveling through time and space, Clementine might embark on various adventures exploring different planets and historical events.
One common theme is friendship. Since there are three OCs, their relationships with each other often form a big part of the story, like in 'The Trio's Friendship' where they rely on each other through thick and thin.
A common theme is the integration of the oc into the Avengers' world. It often involves the oc proving themselves worthy to be part of the team.
One common theme is self - discovery. Since the OC is reincarnated, they often have to figure out who they are in this new life. Another theme is redemption. Maybe in their past life they made mistakes, and now they get a chance to make things right. Also, power - growth is a theme. As they adapt to the new world, they usually gain new abilities and grow in power.
A common theme could be friendship. Oc and Shiho might be depicted as having a strong bond and going through various experiences together that strengthen their relationship.
One common theme is the struggle between good and evil. The oc often finds themselves in the middle of Constantine's battles against dark forces. Another theme is the exploration of magic and the occult. Since Constantine is involved in such things, the oc also gets to experience and learn about this strange world. Also, friendship or partnership is a theme. They team up with Constantine and form a bond while facing various threats.
One common theme could be friendship. Since rikkaidai involves a group of characters, stories might focus on how original characters form friendships with the existing ones.
A theme that can't be ignored is competition. In many 'cars and oc fanfic', there are races or challenges where the oc and the cars work together to win. Also, self - discovery is a theme. The oc might learn more about themselves through their experiences with the cars, like finding out their hidden strengths or fears. This can be really interesting as it shows the growth of the character in the story.