I'm not sure about a specific 'goku x kefla fanfic' to recommend. You could try searching on fanfiction websites like Archive of Our Own or FanFiction.net. There might be some interesting ones there.
Sure, there are quite a few. These fanfictions often take the strong and unique personalities of Goku and Kefla and weave them into a romantic narrative. Some might be more action - packed with their love story developing in the midst of battles and challenges, while others could be more about the quiet, tender moments between them. It really depends on the creativity of the author.
One idea could be a story where Goku and Kefla have to team up to face a new, powerful enemy that neither could defeat alone. They start off not trusting each other much, but as they fight side by side, they learn to respect one another's strength and fighting styles.
One common theme could be the power dynamic between Goku and Kefla. Since they are both very powerful characters in the Dragon Ball universe, exploring how their powers interact and complement each other might be a theme. For example, in battles or training sessions.
Goku would be more likely. He is always open to new friendships and challenges. He has a curious nature and would be intrigued by Kefla's power. So he might approach her first to test her strength or just out of friendly curiosity.
You can expect a lot of creativity. Since it's fanfiction, the authors can play around with the characters' personalities and the Dragon Ball universe rules. Maybe Goku shows a more romantic side that we don't often see in the original series, and Kefla could be softened in some ways to fit the love story.
I don't think so. Comic Thanos has access to cosmic powers and strategies that could pose a serious challenge for Goku. His intelligence and the extent of his powers might be too much for Goku to overcome.
Such content is inappropriate and not in line with the positive and healthy themes of mainstream entertainment. It's likely to be unethical or even illegal.