Ichibei and Oetsu are understandable since they preexisted before anyone and are the creators of the names and the Zanpakutos. Dunno about Senjumaru and Tenjiro , so I can't say... But why is Kirio Hikifune selected to be a Royal Guard ? What is so special about her ? Why was she specifically...
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- She invented artifical souls, a technology that is extremely useful to Soul Society.
- She's monstrously strong just like the other RG members.
- She can make a tree prison that literally eats spirit energy, good luck to most of the cast trying to deal with that. There's a reason she had to fight Pernida specifically, his ability is a good counter for hers as it does not use spirit energy.
Only Ichibei and, in lesser manner, Nimaiya are unreachable monsters
No ALL of them are, the blood Oath Seal shit makes this very fucking clear.
The rest, is very different, especially Kirio
No they're not any different, including Kirio.
In fact of all five RGs
Only Ichibei was deemed strong to be a War Potential, no one of the others was not even Nimaiya
Other Shinigami were considered more threatening than them
Yes the same list that included Kenpachi at a time when he was fucking fodder to anyone who wasn't themselves fodder.
The same list that even Mustache's own people call him a fucking idiot for leaving obvious names like Mayuri off of it.
That list? Which is completely meaningless for power-scaling purposes for obvious reasons.
Being a Royal Guard doesn't automatically put at a higher level than other Shinigami
Kinda does though.
Easy proof?
Kenpachi Kuruyashiki was offered to become a Royal Guard, and yet he is clearly below Unohana
Ah yes the character from a non-canon novel somehow proves fodder can be Royal Guard level.

ha
And without even considering Unohana, Kyoraku, Ukitake, Urahara, Zaraki...
All of whom are complete fodder compared to Kirio.
you can never tell me Kuruyashiki or Kirio were stronger than Yamamoto and Aizen
I can in Kirio's case and I am.
When one is so powerful that you affect all three worlds just by powering up and need to create a seal that necessitates the deaths of three other people just to unleash your full power, absolutely no one in the Gotei 13 compares in the slightest.
And that's ignoring the fact that even with the seal on, Kirio would still be stronger than Aizen.
And again, nobody gives a fuck about the non-canon shithead.
There's a reason why the only RG acknowledged as a War Potential was Ichibei
Yes because Mustache is an idiot or is simply using Ichibei to represent all of them. The list also includes Urahara over the likes of Yamamoto but I don't see you claiming Yama is weaker than Urahara do I?
War Potentials are a cool name to say the 5 strongest fighters on the Shinigami side
That's it
This is a battle shonen no need to complicate things
Yamamoto wasn't included for a precise reason which was in fact openly explained
The fact that other RGs weren't included but Ichibei was included even though he is a RG simply means that they weren't powerful enough to be a threat as great as the others
Not how that works I'm afraid, the fact that Mustache had a reason to exclude Yamamoto doesn't change the fact that, even bearing that reason in mind, Yamamoto is still far more of a threat than two of the names on the list.
He could have any number of reasons for not including the other RG members and we know for a fact it WASN'T because they weren't powerful enough.
Urahara, was according to Aizen, the equal of Shinigami Aizen before the Hogyoku
The guy has a Bankai that can destroy and recostructure anything, can literally heal any wound, boost his body, ignore the foe's durability etc imagine that combined with his intellect
Can use Hado 91 and HADO 99
Fought on par if not better with Aura who is said to be on Shinigami Aizen level
Tokinada said that he could oneshot him with Kido
With the reiatsu cuffs can kill almost anyone, and he was swift enough to fool Aizen so go figure weaker characters
And none of this changes the fact Urahara is weaker/would lose easily to Adult Toshiro, RG Byakuya, Yamamoto and literally every RG member. There is no valid reason why he's on the list and they aren't.
Don't give me that "Toshiro's full power was unknown shit" either because so was Kenpachi's.
The list is completely irrelevant.
Yeah his raw power is pretty amazing lol
Add his smartness and you have one of the absolute strongest
NOPE, again there are several above Urahara who were excluded.
Mayuri is also hella unpredictable but he wasn't chosen
And in one of your precious novels (aka the only one that's actually confirmed to be canon by the way) Mustache's own former soldiers give him shit and call out his stupidity for no including Mayuri on that list.
This doesn't help your case dipshit.
It is as straightforward as it gets, but let's make excuses for it
It really isn't though.
The second Yamamoto was excluded in favor of names blatantly weaker than him, especially given how weak Kenpachi was at the time. It really isn't as straight forward as you want it to be.