Disclaimer: I do not own Dragon Ball Z, or Naruto. They are owned by Akira Toriyama and Masashi Kishimoto respectively. I do not claim to own anything in this story.
"And we're on," one member of the staff, that works behind the scenes on the television show that Piccolo and Kakashi Hatake both present, started. This allowed the two to start doing their job.
"Hello, everyone. I am Kakashi," the white haired ninja of the pair greeted.
"And I am Piccolo, of the Namekians," the green skinned one added. "Welcome back to Piccolo and Kakashi on Theories."
"Today, our topic is based on a certain episode in a show known as Tengen Toppa Gurren Lagann. I have to warn you, this episode is full of spoilers, so if you either haven't seen Gurren Lagann or you have, but haven't gotten to episode eight, I highly recommend you leave this broadcast and go watch something else," Kakashi warned. "We'll give you time."
Piccolo and Kakashi remained still for the next half a minute, allowing for anybody to follow the Jonin's advice.
"You're still here. Good, that means we can get on with tonight's show with no problems," Piccolo commented. "As you must know, Gurren Lagann is an anime show about a boy called Simon, who along with his friends, fight against beastmen that have taken over their post-apocalyptic world. One of Simon's friends is a bombastic and idiotic man called Kamina, who is one of the most memorable characters in the entire series due to his trademark bravado."
"This man's a total fool, though his morals are correct and his strength is impressive. Kamina is basically Simon's brother, though they're not blood related. When episode eight rolls around...Kamina is no longer there. He's killed in a major battle to obtain a massive ship that would greatly assist Team Gurren, the team that Kamina started at the start of the show. However, we ask...what would have happened if Kamina never died in episode eight?"
"After asking that question, we then thought of Nia, who Simon meets sometime after Kamina's death. It's still probable that she would have been added to Team Gurren, but with Kamina still around, it's less likely she would have joined the team. Simon only found her through chance after having run away from everyone in his depression, so without the cause of said depression, Simon would not have ended up at the place he found Nia in. However, it's also possible that she could be discovered another way if Kamina was still alive at that point, so we can't rule her out."
"Later on down the line, the events of the show would still be the same, except Kamina would be doing most of the things that Simon would have done. In the real show, Kamina's death was the main reason for Simon realising his potential. Without that, he would still be the Shinji Ikari-like character he was as a child. Through this, it's likely that Kamina would die at this point, but we're not gonna cop out like that. What would happen if Kamina survived even the initial battle with the Muganns?"
"He'd be in space with everyone else. At this point in the actual series, Viral started piloting the Gurren mech, but since Kamina's still around, Viral would be piloting his personal mech here. This increases the firepower that Team Dai-Gurren have, but the events would still be the same, with Gurren Lagann combining to Arc Gurren Lagann. From here on out, things get interesting. If Team Dai-Gurren do not have Nia with them at this point, then they'll most likely be stuck, as Nia's ring managed to get them to the Anti-Spiral's lair. However, they probably would have invented something else to get there and knowing the series, that would be the case. If they do have Nia, the same things would happen as in the show."
"Kamina would probably die before the final battle with the Anti-Spiral if he hasn't already at this point. Perhaps the Anti-Spiral kills Kamina to inflict total despair on Simon, who then realises his dormant potential, then the final battle of the show plays out as normal. Overall, the show wouldn't change too much, but there's a much higher chance of everything being messed up if Kamina were still alive in later episodes. That sums up our entire episode."
"We might as well call it here," Piccolo suggested.
Kakashi nodded. "So we will. We'll see you next time, audience."
The show ended, with the behind the scene workers remaining behind to work on the show's production while the presenters returned to their lives.