There are no such inappropriate 'Straight Shota' stories in the official Dragon Ball Z canon. Dragon Ball Z mainly focuses on epic battles, power-ups, and the adventures of Goku and his friends to protect the Earth from various villains.
One idea could be the children of the Z - fighters facing a new, powerful and mysterious enemy from a different dimension. This enemy could have unique powers that the new generation has to figure out how to combat.
Perhaps a new Saiyan from Planet Vegeta who was sent away as a baby before its destruction and now returns to Earth in the next generation. He could bring with him a different perspective on Saiyan culture and power. He might have been trained in a different way on the planet he grew up on, and his arrival could stir things up among the Earth - based Saiyans.
One alternative is to focus on character backstories. You could write about the early days of Piccolo, how he came to be the way he is. Another option is to do crossovers with other non - sexual universes. Maybe a story where the Dragon Ball Z characters meet characters from a magical anime world and they have to work together to solve a problem. Also, you can write about the relationships between the characters in a platonic way, like the deepening of the friendship between Gohan and Krillin.
Dragon Ball Z was a very famous manga and anime with many powerful characters. Due to the rich plot and battle scenes, it is difficult to give a specific ranking. Here are some characters that I think are very powerful:
1 Sun Wukong: As the main character, Sun Wukong is one of the most powerful characters in Dragon Ball Z. He had the ability to transform into a Super Saiyan and could easily defeat most enemies.
Fliesa: Fliesa is a very powerful enemy. He has the ability of the Demon Fruit to transform into a huge demon. His strength and speed were astonishing.
Buu: Buu is a very powerful enemy. He has the ability to devour others and can increase his strength indefinitely. He was so powerful that he could even defeat the Super Saiyan Sun Wukong.
4 - 18 and Cyborg 17: Cyborg 18 and Cyborg 17 are very powerful characters in Dragon Ball Z. Their abilities can allow them to become Super Saiyans or Demon Men. Their strength and speed were astonishing.
5. Takitt: Takitt is one of Buu's subordinates. He has powerful combat skills and energy attacks. He was also a very powerful character.
It should be noted that this ranking is not absolutely different. The readers and viewers may have different opinions.
One interesting crossover could be a battle between Hulk's brute strength and Goku's Super Saiyan power. Maybe in the fanfic, they start off as rivals, with Hulk misunderstanding Goku as a threat to Earth. Their fight would be epic, with Hulk's limitless rage against Goku's increasing power levels. It could also explore how their different universes' power systems interact.
Hulk's powers would likely be affected by the ki energy in the Dragon Ball Z universe. His gamma - based strength might be enhanced by ki, making him even stronger. Also, his ability to heal and regenerate could potentially be influenced by senzu beans or the natural healing properties of ki.
The full story of Dragon Ball Z is about Goku and his friends protecting the Earth from various powerful villains. It starts with Raditz arriving on Earth, revealing Goku's Saiyan heritage. Then there are battles against the Saiyans like Vegeta and Nappa. Later, the threat of Frieza emerges on Namek. Goku transforms into a Super Saiyan for the first time to defeat him. There are also the Androids and Cell arcs which bring new challenges.
A Kryptonian in the Dragon Ball Z universe could potentially be a very powerful addition. Their natural abilities like super strength, flight, and heat vision could make them a force to be reckoned with. However, they would also face challenges as the Dragon Ball Z world has its own power scale with ki-based powers. They might have to adapt to the different fighting styles and power sources. Maybe they could learn to use ki in addition to their Kryptonian powers, or they could find a way to combine the two in unique ways.