One theme to avoid is any form of non - consensual or inappropriate relationships. These go against the positive and heroic nature of the characters like Goku.
One common theme is mentorship. Goku often takes on the role of a mentor to Bulla, guiding her in her martial arts journey. Another theme is friendship. They form an unlikely friendship which is explored in many stories.
Well, first of all, any sexual or overly suggestive themes should be avoided as they are not appropriate for a wide audience. Also, themes that distort the original characters' personalities in a vulgar way are not good. For example, making Hermione or the twins act in a way that is completely out of character just to fit into some inappropriate plot. Fanfiction should be about exploring the characters in a respectful and creative way, not exploiting them for improper content.
One common theme is the power of friendship. Despite their differences, Goku and Bulla often form a deep bond in fanfics. Another theme is adventure. They usually go on some kind of exciting journey together, like searching for a powerful artifact or saving the world from a new villain.
Well, the main theme to avoid is the sexual content which is inappropriate. Also, any themes that distort the original characters' personalities just for the sake of the inappropriate content should be avoided. For example, making a strong, serious character act out of character in a vulgar way.
Fanfiction should ideally be a creative exploration that respects the essence of the characters. Instead of lemon fanfiction, try to find ones that develop interesting storylines for Goku and Bulla, such as ones where they team up to face a new threat or explore new aspects of their powers.
In 'bulma goku lemon fanfiction', a frequently seen theme is the exploration of unspoken feelings. Since Goku is a bit oblivious in the original series, fanfictions might delve into how Bulma really feels about him and vice versa. Also, the theme of family could be present, considering Goku's family ties and Bulma's role in his life and the lives of his friends.
Common themes often involve the unexpectedness of their relationship. Since Goku is a pure - hearted warrior and Android 18 was initially an enemy. In lemon fanfictions, there might be a focus on the passion that arises from this unusual pairing. Also, themes related to redemption and acceptance can be found, as Android 18 might find acceptance in Goku's world, and Goku might see her in a new light. This all gets intertwined with the more 'lemon' aspects which are often used to heighten the intensity of their relationship.
One common theme is the exploration of a different kind of relationship between Goku and Bulma. Since in the original they are friends, fanfictions often play with the idea of them having a more romantic or complex bond.
Well, first of all, the 'lemon' aspect usually implies sexual content, which is not suitable for general audiences. It violates the moral and ethical norms in most cases.
Well, obviously the adult and inappropriate themes should be avoided. Fanfiction should be more about exploring the relationship in a positive and healthy way. Themes like excessive sexualization are not suitable.