Chi - Chi might be one of the first to support them. Despite her past relationship with Goku, she could see how happy Goku is with Android 18 and decides to be happy for them. Also, Krillin would likely support the marriage. He has a deep friendship with both Goku and Android 18. He knows Android 18 well and trusts Goku, so he would be all for their union.
In Android - related fanfic, one key element could be the futuristic settings. Since Android often represents advanced technology, fanfics might depict a world where Androids co - exist with humans in unique ways, like in a high - tech cityscape. Another element could be the relationships. This could involve the bond between an Android and its creator, or the friendships/romances they form with humans. Also, exploring the ethical issues surrounding Androids, such as their rights and how they are treated, is a common aspect in such fanfictions.
To write an engaging Android 0 fanfic, start with a unique concept. Maybe give Android 0 a special power or a mysterious origin. Then, create interesting characters around it. Humans who interact with Android 0 can have diverse personalities and motives. Also, build a vivid world for the story. If it's a dystopian setting, describe the rundown cities and the strict laws regarding Androids. Use action and suspense to keep the readers hooked. For example, Android 0 could be on the run from some evil corporation that wants to control it.
Android 21 is such an interesting character to create fan fiction about. One could write about her origin story in a different way. Maybe she was created by a different scientist with a different purpose. This could lead to a whole new set of adventures and interactions with other characters in the Android universe.
It could lead to all sorts of wild adventures. Goku being immortal would mean he could face even greater challenges and protect the universe for an eternity.
It could lead to a completely different dynamic in the story. Maybe she'd have a softer side or face different challenges because of gender expectations.
It could lead to a completely different story arc. Maybe Goku would join forces with the villains and cause chaos in the universe.
A possible plot could be that Android 18 and Goku are thrown into an alternate dimension where they have to rely on each other to survive. In this dimension, they face challenges that test their friendship and fighting skills. Android 18 might learn some of Goku's signature moves and Goku could learn more about the technology within Android 18.