If we consider Goku's Ki blasts and Eren's Titan transformation, they could create a really powerful combination. Goku could use his Ki blasts to weaken a Titan from a distance, and then Eren could finish it off with a powerful Titan - powered attack.
The combination of abilities is really interesting. For instance, Piccolo's ability to stretch his limbs could be used in a very unique way in the world of Attack on Titan. He could potentially reach out and grab Titans from a distance, or use his stretching to rescue comrades in danger. And if we consider the Attack on Titan characters' ODM gear skills and combine them with the speed and agility of the Dragon Ball Z characters, we could see some amazing acrobatic battles against the Titans. For example, Trunks could use his sword - fighting skills along with his super speed and the ODM gear to slice through Titans in a flash.
The Survey Corps' ODM gear could be used in new and creative ways in a crossover. They could use it to quickly move around the Tokyo Ghoul cityscape, giving them an advantage against the ghouls. Meanwhile, the ghouls' kagune could be used to attack Titans in ways the Attack on Titan characters haven't seen before. For example, a ghoul could use its kagune to slice through a Titan's nape from a distance.
One popular idea is to have Goku from Dragon Ball Z face off against the Titans from Attack on Titan. His super strength and fighting abilities would make for an epic battle. Another is to see if the Dragon Balls could be used to somehow stop the Titan invasion. Maybe the Z fighters could team up with the Survey Corps to achieve this.
Well, you could start with Goku's simple and food - loving nature. You could pair that with Issei's perverted but determined side. For example, Goku might not understand Issei's pervertedness at first, but they could bond over their determination to get stronger. Issei could learn from Goku's straightforward approach to fighting.
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.
Goku is very important. He is the main protagonist and the one Raditz is after. Piccolo is also crucial as he teams up with Goku against Raditz, which is quite unexpected considering their past. And of course, Raditz himself is a key character as he is the main antagonist in this part of the story.
The Avengers' abilities would bring a whole new level of combat to the Attack on Titan world. For instance, Iron Man's flight and advanced weaponry would give him an edge in aerial attacks against Titans. Captain America's shield could be used to block Titan attacks and also as a throwing weapon. Thor's hammer would be a powerful melee weapon against the Titans. The characters from Attack on Titan, on the other hand, have their own skills like Eren's Titan - shifting ability. It would be interesting to see how they all work together.
At first, Naruto would likely be very curious. He'd be eager to learn about this new world of Dragon Ball Z through the fanfiction. As he delved deeper, he'd start to form his own opinions about the characters. He might admire Goku's pure heart and his never - ending quest for self - improvement, and perhaps think about how he can apply some of those qualities to his own life as a ninja.
The characters from Pokemon, like Ash, would be very curious about the Titans. He might try to understand them first instead of immediately attacking. Meanwhile, the characters from Attack on Titan, such as Mikasa, would be initially cautious of the Pokemon. But as they see the Pokemon's powers, they would start to trust and work with them.
Goku's power level is extremely high in Dragon Ball Z. In a crossover with Harry Potter, his ki powers would be far stronger than most wizards' magic in terms of raw destructive force. However, magic has a different kind of versatility. For example, a wizard could use Apparition to teleport, while Goku has to fly. Harry Potter, on the other hand, has the power of love and friendship which gives him an edge in some situations, but physically he is much weaker than Goku.
Future Trunks is often a central character. His time - traveling aspect gives a lot of scope for interesting plotlines in 'Dragon Ball Z Legends Fanfiction'.