Powerful bloodlines meant vast amounts of chakra, specifically represented by figures like the First Hokage, Naruto, and Sasuke. Kōichi dismissed this first direction before even taking a step. He had no bloodline.
What about Tailed Beasts? In Kōichi's memory,anyone who housed a Tailed Beast, becoming a Jinchūriki, never lacked for chakra. Even the One-Tail Jinchūriki,Gaara, could frequently use high-level ninjutsu during the Chūnin Exams, even unleashing a large-scale technique capable of destroying a forest. The amount of chakra consumed in that battle against Kimimaro would absolutely overwhelm an ordinary Jōnin!
Kōichi didn't outright discard this option. "Right now,I'm too weak to capture a Tailed Beast, but that doesn't mean it's impossible in the future. As for the negative effects of a Tailed Beast's rampage..." Kōichi wasn't overly afraid. In his view,with sufficiently high mental energy and powerful enough strength, one could completely subdue a Tailed Beast. From the One-Tail to the Nine-Tails,all Jinchūriki in the later stages were able to tame their Tailed Beasts.
Of course, the Tailed Beast option was for the future, a very long time from now. For the present, Kōichi had to shelve it.
He turned his target to Sage Mode. However,after thinking for a while, Kōichi shook his head. From beginning to end,the Naruto world had only three places where one could train to achieve Sage Mode: Mount Myōboku,Ryūchi Cave, and the Forest of Death. These three sacred lands corresponded to the toad,snake, and slug summoning animals, respectively! In other words,to train in Sage Mode, one must master the Summoning Technique and form a contract with one of these three species. And that was merely getting the entry ticket. The difficulty of training Sage Mode was notorious. Even Jiraiya's Sage Mode was an imperfect version,requiring the two Toad Sages to gather natural energy for him.
Reluctantly, Kōichi abandoned this path as well, finally settling his gaze on the "Super-Strong Body" option. "Chakra extraction is the combination of physical energy and mental energy.The stronger these two are, the more chakra one can extract, and the higher the upper limit becomes!" "In other words,if I train my body to be powerful enough and my mental energy high enough, I have the opportunity to possess large-scale chakra reserves."
This judgment wasn't made recklessly. He knew very well that such people indeed existed in the Naruto world. For example,his classmate, Might Guy! Through day after day,never-ceasing effort and training, he possessed a terrifying physique, even capable of opening all Eight Gates and nearly kicking Madara Uchiha (in his Six Paths form) to death during the Fourth Great Ninja War. Don't think Guy only used taijutsu;those final kicks also contained immense amounts of chakra. The chakra capacity required to nearly kill Six Paths Madara was unimaginably vast!
If that example was too extreme, then the Akimichi clan was a good reference. This clan loved to eat,were often heavy-set, but in battle, they could absorb their physical energy to erupt with powerful combat strength. This was also a manifestation of a super-strong body generating massive chakra. After all,the later battles of Akimichi Chōji, where he thinned down and his power multiplied, were clear examples.
After some deliberation, Kōichi made his decision. Compared to the Akimichi clan,he chose Might Guy's path. An overly bulky body was too conspicuous,lacked agility, and without the Akimichi clan's secret techniques, converting body mass rapidly into chakra was a major problem. Might Guy's path was something he could definitely follow. Wasn't it just training?!
And he just happened to have a system task right there: The Unbeatable Cockroach! Kōichi glanced at the Overlord System;the progress for this task was already halfway done. By his estimate,it would probably be completed in a few more months.
But this wasn't Kōichi's ultimate goal. "Since I have the Recovery Jutsu,I can completely increase the training volume further, as long as I can endure the hardship!"
Although he made this decision, when it was time to sleep, Kōichi still felt restless. His bright eyes stared at the dark ceiling as he thought about this world's future development. "The Third Great Ninja War will probably break out soon.At my age, it's very likely I'll be involved." "Cultivating a super-strong body isn't something achievable in a few days.I must increase my strength further before that happens!" "My chakra capacity upper limit is restricting my development."
Unable to sleep, Kōichi simply sat up. "Since I can't quickly raise the upper limit,why not try to reduce the chakra required for each ninjutsu?"
The moment Kōichi conceived this idea, a long-absent "Ding!" sounded in his mind.
"First Research Project: Reduce the chakra cost of the C-rank ninjutsu 'Earth-Style Wall' by half!" "Reward: Ten Overlord Points! (Overlord Points can be exchanged for Overlord Skills or to upgrade currently owned Overlord Skills.)"