It should be understood that while I was certainly not the only sage to exist in Konoha since it's founding I was the only one with enough sage chakra to possibly pull off something like this. For all the other sages of Konoha(which was the First Hokage and Jiraiya) sage mode was sort of like a temporary boost and burned through their chakra at a rapid rate. For me however I had always been in sage mode and thus technically didn't burn my chakra to maintain it as it was my natural state.-
I also had enough chakra to match a tailed beast drop for drop all the way up to the nine tails. This was both a boon and a curse as so much chakra also meant that if I didn't suppress it within my body the leakage alone would be enough to bring most chunin to their knees out of suppressive weight alone. In this case though my chakra pool was a boon as it meant I could effectively work as the battery for the new barrier that stretched over the entire village. -
Obviously not permanently but just during the construction phase of the barrier where the most chakra was wasted. I ended up sitting cross legged in the center of a seal formation radiating my chakra passively while I meditated.
"How you holding up brat?" My sensei asked worriedly.
I opened my eyes and smirked "You may want to tell them to up the drain, I regenerate the stuff faster than this is taking it." I said smugly.
"Of course a monster like you would say that, I don't even know why I thought this would make you uncomfortable at all?" she said with a roll of her eyes.
"Jokes aside you sure this is enough to work with? If we are doing this I'd like it to be the best possible so no need to be considerate, take all my chakra if it'll make it stronger." I said seriously.
"Are you sure about this Kenzo?" she asked seriously.
I nodded "Yes, lets make a barrier unlike anything the worlds ever seen before." I said with a grin.
She nods before turning to the group of seal masters working nearby "You heard him, he wants better than your best so make it happen!" she commanded and the seal masters took on expressions of determination as they got to work.
The results of my decision became clear immediately as the drain increased dramatically and finally exceed my regeneration by a smidge. This alone shocked the seal masters as well as my sensei because the current drain was enough to turn an elite jonin to a shriveled corpse in ten minutes but was BARELY more than my natural regeneration of chakra. I was also surprised by this as I likely never would have discovered this aspect of myself without this endeavor. Jutsu were sort of one time payment things so anytime I used one I barely felt the amount of chakra needed for them.-
Due to this finding my actual rate of chakra regeneration was rather difficult as I had never had enough of a drain to accurately measure it. While I was glad to finally understand this I couldn't help but feel a bit embarrassed at the envious looks I got from my sensei and the seal masters. While I felt the drain from the formation I had the brilliant idea to begin experimenting with my chakra armor since I'd now have a potent external source "attacking" it. -
My sensei just looked at me speechlessly as the bright blue chakra construct manifested on my body in an unstable manner as the chakra it was made up of was rapidly being ripped away by the formation. I merely grinned and worked to stabilize the armor against the pull of the formation which proved an excellent idea as I was forced to extend the armor over my feet to stave off that weak point. Honestly this only worked because I deluded my body into thinking I was in a life threatening situation and thus had it pulling out all the stops to save me.-
'All that's left is to extend the armor over my head and the technique will finally be complete. Best to leave that for when I am not getting drained of chakra so aggressively.' I thought satisfied once I got the hang of covering my full body in my chakra armor.
"From the looks of it you should have the moniker "Konoha's blue beast" rather than Might Guy." my sensei said and I shook my head.
"I'd rather not have any moniker at all if I can help it, if I joined a battlefield it'd be bullying at this point." I said honestly.
I meant it too as whether it was my chakra reserves, jutsu repertoire, taijutsu or physical durability I was next to impossible for anyone to match. Not even chakra metal can penetrate my skin so I could literally stand still in the middle of the average shinobi army and take no damage at all. If I fought back I was literally an army of one as I could route an entire army by myself. I included the general of that army as well that was either an S rank or high elite jonin historically.-
I had to grudgingly admit that I was an S rank threat at this point simply due to my unkillableness. There was no other way to see it as the most dangerous sort of shinobi was the one that wasn't afraid of getting hurt. Sure it could be argued that destructive capability was also an important factor but what's more threatening. A shinobi that can burn everything for miles but can be killed with a kunai or one that can burn a smaller area but is practically immune to physical damage and all jutsu up to S rank?-
In a short confrontation easily the first type but in a long drawn out affair like a battle the second wins hands down. I was approaching a perfect fusion of both types as my large area jutsu were also quite powerful. So yes I was an S rank shinobi and according to my sensei easily the hardest to deal with for anyone who wasn't the Third Tsuchikage Onoki. Dust release was just that dangerous and not even my defenses were likely to stand up to it at all. I certainly wasn't going to argue this fact either knowing how dangerous Shiro's ability that was on the same level was.