Thank you for your listening. I am always happy to help another.
Akimichi Clan
I am gland you enjoy my twist and your more then welcome to use my idea in your fanfic as long as you give credit. I spent alot of time on this looking up the gland system and studying the effects of having the thyroid gland removed. Which I presume that this clan has a more then ordinary gland to be able to use the jitsu they do.
Aburame Clan
To be honest I just got excited to share my own version. hmm

I was just explaining that in my own version it wasn't a special summon from the past/ secret. It was instead a evolution of the insect itself, which it is just my taste. I felt that this evolution of the insect itself opens up the possibilities for the entire clan and creates new conflicts in the story. In short the evolution route makes new jitsu's for the clan that can be explored/ enjoyed by the writer(new abilities and concepts that were never conceived in the original) and by the audience. As opposed to it being a summon, then it would be just that. But I insist that this is your fanfic I am just someone here to bounce ideas off of.
Hyuuga and Uchiha
Absolutely! I hated the idea of an EMS and even more that the EMS turned into a rinnigan. I mean the idea of a Kenjitsu is that it presents obvious drawbacks and dangers. I mean Sasuke just spams Ameratsu and sussonno w/o regards to his eyes. Then its like well why doesn't everyone have and eye trading day. Problem solved. If I were in your shoes I think I would
1. Not have EMS
2. Have EMS but have a VERY specific set of rules about how to obtain it. Like the two clans Hyuuga/Uchiha have a child and they are born with a much more resilient eye, with both qualities (battle/sensory). That can not have a MS but can activate a EMS/B Rinningan (kinda like Edo-Madara in the latest Naruto Manga)
Inuzuka Clan
I think that this is a splendid idea. Then if it is an very rare elite tracking pack.... that is a Kenjitsu I would suggest that they have some major drawbacks and some awesome abilities.
Nara Clan
I typically don't watch fillers..... they just make me sad..... lol. I love the idea of the shadow stag (i would love to draw that summon, in fact i might) but it is not versatile and i my opinion it is a really straight forward ability that shicka doesn't need. He has both shadow strangle and shadow sewing to battle large summons.
In my own version my goal wasn't to have shicka a kage, but someone who was like a high kage guard, that could really take the Kage's place for short periods of time. In addition I wanted him to really get attached to his masters combat knives (i'm all about narrative/character development)... eventually he would pass them on and they would become a the Leaf's version of a treasure tool. Lol in fact in my own version it was actually Sasuke that became Hokage and Shicka was his right arm and going off on a rant that the 2 tails jink. was one of sasuke's kids.
Anyway, I guess I just love the character alot. But back to your story..... I would need to hear much more about this demonic summon, how it became to be, why it allies itself with the Nara/ teaches the narra, why it is a kenjitsu that is has not been used before/ in a very long time, what is the summons's personality like (since it will become a main feature of the character), and how it would impact/benefit shicka.
BEWARE LONG POST
To be honest with you, a large amount of this I based of already existing anime and manga. Shows like Full Metal Alchemist and Avatar the Last Airbender.
Alright then.
Aburame Clan
Now I see what you mean. Okay, I like it and I think that with your permission I will incorporate that later in the story, but I still feel inclined to leave in the summons as a different idea altogether.
Hyuuga and Uchiha Clan
I think I'll choose option 2 there, although I wonder who I might get to make that happen. I suppose maybe when...
Inuzuka Clan
Any ideas? I was thinking that one key ability they would have is lasting power. They'll be big enough to ride, and will be like Uruk-Hai in that they can run for days after a target without rest. I was thinking also that these wolves could all have elemental affinities. As for drawbacks, I can't really think of any. I was thinking that I could just go with them being extremely wild and ferocious, meaning that if summoned, they will only work with those that they consider to be true Inuzuka, "Of sound mind, controlled hunger, and wild of heart". I don't know, that needs re-wording.
Nara Clan
I can see the logic there, like father like son in their Second in Commandness. I know that I intend to kill off Asuma at some point, but I can't exactly remember when. Either way, I like the idea of turning Asuma's knuckle blades into a Konoha sacred item.
As for the demon, I was thinking of basing his character and demeanor of off L from Death Note. He would have a seemingly playful demeanor, and of course he would be highly intelligent. One thing which I wanted to emphasize though is that he is not a "Good guy". He is a servant to the Nara not by choice, and he won't go out of his way to save anyone non-Nara without benefit to himself.
In order to explain a bit about this demon, I have to explain the early history of my world.
When the world was first created it was created by a collection of gods and demi-gods. Due to their immortality what they always did was create a universe, populate it, and then go and 'entertain themselves' for as long as they wanted. This process of course re-did itself when the universe eventually died.
Now, the general universe and the energy within it were created by the gods, but the demi-gods populated it. They created everything from plants, to animals, to shadows.
Keep in mind that I'm talking about the entire universe here.
On the specific planet that is the Narutoverse, a demi-god created beasts. All the giant creatures that will later be called summons. He created them and they went about doing whatever.
Another demi-god then created humans. That didn't go so well, and they struggled badly to survive. He had created them with the potential to be more powerful than any beast, but that was kinda wasted due to the fact that he didn't give them the knowledge (How to mould and manipulate chakra) to use their potential.
When humans were at an all time low, most of them hiding in the mountains and living underground, he made the decision to go down himself and teach them. Step in Sage of Six Paths. That was the demi-god himself. He taught them how to manipulate chakra only at first, thinking they could figure out moulding by themselves later.
What this is essentially akin to is bending from Avatar the Last Airbender. He taught them to convert their chakra into the elements, but not how to specifically shape it like we see people do with techniques such as Water Dragon Jutsu, Rasengan, Chidori.
Throughout all this he was of course operating in a human vessel, and as such he had limited time. He extended this time by staying in Sage Mode extensively, and elongating his life using the natural life energy from around himself.
He led the humans onto the surface after teaching them, and although for the most part he let them do the fighting themselves so that they could learn, he did step in whenever they fought beasts too powerful for them to handle.
Soon, humans began to break away in groups, spreading out now that they were more confident in their powers. This growth pushed the beasts further and further back, and they eventually all but disappeared into the mountains.
At some point, the Sage and his people came across the Jyuubi, the strongest creature in existence. And the Sage fought it, defeated it, and sealed it inside himself.
Now, it has to be pointed out that the demi-god who is the Sage of Six Paths created humans with souls, and due to his love for his creation he made it so that they all went to a kind 'heaven' after death. Most demi-gods didn't really care that he did this, since there are countless galaxies to mess around with, but one did. That one, created "hell" and "limbo", and he created an easy way to get a ticket straight there in the form of the Shinigami.
When the Shinigami was first created it was actually a physical manifestation of death, that roamed around killing things and banishing their souls to limbo. It should be noted that it only did this to beings it deemed deeply sinful, and as such it wasn't really doing anything wrong. At some point it gained a following called the Jashin cult (I had to sneak them in somewhere). They chose seven representatives to be the demon's "guard", since in my fic they followed the idea of the Seven Deadly Sins. These seven were granted great power due to them being in the demon's presence. (I'll refer back to this in a bit)
So, when the Sage realized that the Shinigami was roaming around killing things, he was not happy. He confronted it, and defeated it, but in trying to completely banish it from the physical realm, he damaged himself irreparably. The damage he did to his own spiritual form was quite severe, and he was close to death (in that his spirit would explode, and reform itself over millenia). So, firstly he split up the jyuubi into bite sized chunks (Bijuu), and then he split his powers between his two sons, and then he kicked the bucket.
BTW, the Jashin cult was headed by a clan called the Kuma. And although they never directly put any of their own members as one of the seven chosen ones, they were the ones who selected the seven from the cults ranks. When the Shinigami was defeated, the cult was in uproar, and tried to destroy his followers. Of course, they were hammered. With their numbers extremely low, they attempted to summon the Shinigami back by sacrificing the seven chosen ones. HOWEVER, of the seven, 4 of them aborted the sacrifice midway, causing a reaction that killed most in attendance, and sealed away the other 3 for X years. The 4 who escaped, simply scattered into the world, thinking the Jashin cult was dead. But one Kuma survived, and for generations he passed on the knowledge of the cult, waiting for the day that the 3 who were sealed away, would return.
BTW, one power the seven all possessed was immortality. And guess who's one of the seven... HIDAN! Although he's gone crazy over time, largly due to the guilt that he still has over abandoning the summoning, and getting everyone else killed. That's the reason why he does all the sacrifices, technically speaking the Jashin cult never required sacrifices, unless it was for a specific reason. And Hidan is in fact significantly stronger than in Canon, due to the ludicrously long life, but once again, he is batshit crazy.
Okay, I just realized that I still haven't spoken about the demon of the Nara.
He's not a really a demon, but a demi-god, and the specific god that created darkness and shadow (I am aware that those two don't actually go together). He met a human on the planet, and normally he would just kill him and move on, but this human was smart, very smart.
He made a deal with the demi-god, that they would exchange riddles for his life. (Like Gollum and Bilbo in The Hobbit). The demi-god, curious as he was, accepted. And subsequently lost.
He wasn't angry about it however, since he was now fascinated by this human who seemed to be blindingly intelligent. Eventually they made a deal that if the human won a series of mind games, then he would ensure the longevity of his family, and teach him how to manipulate shadows. In the end he lost, but it was because he was tricked, and that in itself pissed him off. Due to the terms of agreement however, he couldn't kill the human.
From then on, the Nara (this guys clan), never lost their Clan Head, before he had borne a child. Ever. Because if he ever came close to being killed, then the demon would bail him out.
When I think more on it, I realize that this isn't really a kinjutsu, but I think that's alright since it isn't something one can do voluntarily. However I think I might say that you can summon the demi-god at some point, but once you do, it no longer protects you and if you die without having had children, the process is broken and it goes free.
Sorry, but one other thing I forgot to finish was about the bending. I said that at first all humans could do was bend like in ATLA, the Sage eventually taught them the manner in which hand seals could be used to manipulate their chakra. However he didn't teach them all the hand seals, and there is a major drawback of using them.
The way bending worked was simple. Your body created chakra and converted it to your natural affinity allowing to you to expel and control it. However it needs mentioning that once you tampered with this natural process, it was a very difficult road going back. So using hand seals to produce more precise and specific outcomes meant that you gave up the ability to bend freely.
At first most humans chose to stick with bending, due to the fact that hand seals were still quite limited. But as time wore on and they became more and more useful, allowing someone to use more than one element for example, more people switched. The rate of change got so drastic, that the benders began forming temples where they tried to keep bending alive.
They succeeded in that bending still exists, even in Naruto's time, but it only really exists in those temples.