Well, if Naruto kills Sirzechs in a fanfic, it might be a shock to fans of both series. Sirzechs is a powerful character in his own right. It could be that the fanfic writer wanted to explore a 'what - if' scenario where Naruto's ninja skills and values clash with Sirzechs' power and leadership. It could also be part of a larger plot where Naruto is somehow misled or has no other choice but to take this extreme action.
In a fanfic where Naruto kills Sirzechs, it could be a very interesting concept. Maybe it's a crossover universe where the power dynamics are completely different. Naruto, with his powerful jutsu, might have a reason like protecting his own world from a perceived threat by Sirzechs. However, it also depends on how the author has set up the story, the rules of the world they've created, and the motives given to Naruto for such a drastic act.
If Naruto kills Sirzechs in a fanfic, it could be a result of a miscommunication or a power struggle. Naruto is known for his determination and protecting his friends and village. Maybe in this fanfic, Sirzechs is seen as a threat to Naruto's world or loved ones. It's also possible that the writer is trying to create a unique story by pitting two very different yet powerful characters against each other in a life - or - death situation.
Chapter 390, "Might as Well Call it Gu Hang Star Zone", is the clearest early answer because it turns Martin Nelli's situation into a concrete plot event. The setup is In Gu Hang's hands, the family either turned to dust or kneeled in..., but the pressure keeps building through He had considered the possibility of Gu Hang's success, but even in....
Chapter 394, ", The Choice of Flying Wing Star", is the clearest early answer because it turns Flying Wing Star's situation into a concrete plot event. It opens with All these costs were borne by Flying Wing Star, which then obtained... and closes on The equipment was purchased, and the personnel were specially....
Chapter 352, ", Swimming Upstream", is the clearest early answer because it turns Li Kexi's situation into a concrete plot event. The chapter turns that into something concrete by moving from In the face of a full retreat, there was actually a legion moving... to This caused the communication channels between human forces to be....
Chapter 373, ", Alpha-class Psychic", is the clearest early answer because it turns Alpha-class Psychic's situation into a concrete plot event. It opens with Gu Hang had never underestimated the state religion; even though they... and closes on As long as the number of registered believers didn't decrease, that....
Chapter 212, ", Starport Technology", is the clearest early answer because it turns Black Box's situation into a concrete plot event. The setup is For the Wind Falcon and the Lion Tank, the problem wasn't too big., but the pressure keeps building through The components produced by the Black Box weren't many in number and....
Chapter 321, ", Spiritual Energy Transmission", is the clearest early answer because it turns Storm Mage Corps's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Not having to fight is a good thing. and follows through with A series of 'thud, thud, thud' footsteps sounded, as forty....
Chapter 324, ", New Kings' Council", is the clearest early answer because it turns Alliance's situation into a concrete plot event. The setup is Taking various factors into account, Gu Hang finally decided to adopt..., but the pressure keeps building through In fact, when he initially conquered the Green Valley Region and the....
Chapter 359, ", Chaotic Vanguard", is the clearest early answer because it turns Mecha Knights's situation into a concrete plot event. The chapter gives readers a real answer by opening on Then, in a split second, one died. and ending on Meanwhile, inspired by the rallying call of the Chaotic Vanguard, the....
Chapter 369, ", Fundamental Solution", is the clearest early answer because it turns Nest Capital's situation into a concrete plot event. It opens with But what could she possibly do alone? and closes on But it doesn't matter, if it exists, it will be nationalized and....
Chapter 398, ", Just Like Students of Our Youthful Days", is the clearest early answer because it turns Alliance's situation into a concrete plot event. It opens with He did not miss the opportunity to change his fate; during his school... and closes on What comes next is of utmost importance!" "What should we do?!" "We....