Sure they can be copied - the Chidori uses one of them... and while I hadn't thought of making it so explicit, I did put the number of seals at 108 with its significance in mind. They aren't more widely used because a) as noted, they CAN NOT be rushed, and b) you've got to throw some massive power into them or nothing happens, too much to risk on a single move unless you're absoultely certain you'll hit. Usagi does, indeed, probably have a bigger reserve than Naruto in his own right, but thanks to his tenant he can literally never run out, as long as the fuzzy bastard cooperates. The power involved is why the technique forms outside the body before it's realeased, the reason for the Stars is that each one of the set releases just barely less than the maximum the user's body can channel at once and not damage itself.
As for the 'no two jutsus' rule, I'm afraid not, N, because we've seen Naruto do it for Harem no Jutsu and to transform his real sefl into a fuuma shuriken while a kage bunshin threw him to Sasuke, and while I can't think of the specific instance I'm sure there's been at least one other person, without counting no-seal techniques like Rasengan or doujutsu.
I've been thinking about methods that advanced bloodlines come into being, also - I'm thinking that there's probably three major ways, all of which require being done either in utero or immediately after birth:
a) keep a jinchuuriki alive and relatively sane long enough to reach breeding age - the children with have a number of traits strongly reminiscent of the demon involved, with overall power depending on how strong the demon was. This is probably where the real wierdies like the Hoshigake and Orochimaru come from.
b) contract with some set of animals for each newborn of a family. They'll gradually get more and more traits resembling the contracted animals. Ex: The Inuzuka, with the enhanced senses, heavy clawlike fingernails, fangs, and ability to communicate with dogs, all of which get slightly more pronounced with each generation. Aburame are probably highly adapted also, but internally more than externally. Shizune, if she really does follow the Inuzuka-with-a-pig pattern, is from a much more recent clan.
c) do something that messes with the Celestial Gates - generally some kind of sealing, either directly or binding a minor demon or spirit in such a way that they feed power through one instead of into the main chakra system. This has the least real evidence, and would have the most varied effects, but logically if you mess with the View Gate in a permanently-altering manner, you get a dojutsu of some kind, and one might guess that while screwing with the Death Gate would be invariably fatal, Snakepants figured out some way to do both Life and Death gates without making Anko abort, and that's why Hotaru can heal or harm with a touch.
In all three cases, the reason the change is hereditary is that it's done before the chakra system has fully formed, and it therefore shapes the life around it, with how well it sticks for the next generation depending on how close a match can be found for a mate - Naruto and an Inuzuka girl would likely get kids who looked like he does semi-transformed by kyuubi chakra (whether that would eb a good or a bad thing is a bigger question, but just being in the company of the DOG clan is probably enough to piss the fox off; ) two doujutsu users are pretty much guaranteed to carry forward one of the doujutsu traits, though unless they're very similar to begin with a combination isn't likely; and the Yamanaka elders are definitely barking up the right tree as far as strengthening the bloodline, wanting to get Ino together with one of the Haruno twins.
Hypotheses, all, presented for the sake of argument and because world-building is fun.
- CD
ETA:
SERVO: Loook *deeeeply* into my eyes... Tell me, what do you see?
CROW: (hypnotized) A twisted man who wants to inflict his pain upon others.
Next morning, Harry found himself butt-naked in the other side of town, mouth tasting of lima beans. - from Uzumaki Harry by Shadow Crystal Mage
--
"Anko, what you do in your free time is your own choice. Use it wisely. And if you do not use it wisely, make sure you thoroughly enjoy whatever unwise thing you are doing." - HymnOfRagnorok as Orochimaru at SpaceBattles
woot Med. Eng., verb, 1st & 3rd pers. prsnt. sg. know, knows
As for the 'no two jutsus' rule, I'm afraid not, N, because we've seen Naruto do it for Harem no Jutsu and to transform his real sefl into a fuuma shuriken while a kage bunshin threw him to Sasuke, and while I can't think of the specific instance I'm sure there's been at least one other person, without counting no-seal techniques like Rasengan or doujutsu.
I've been thinking about methods that advanced bloodlines come into being, also - I'm thinking that there's probably three major ways, all of which require being done either in utero or immediately after birth:
a) keep a jinchuuriki alive and relatively sane long enough to reach breeding age - the children with have a number of traits strongly reminiscent of the demon involved, with overall power depending on how strong the demon was. This is probably where the real wierdies like the Hoshigake and Orochimaru come from.
b) contract with some set of animals for each newborn of a family. They'll gradually get more and more traits resembling the contracted animals. Ex: The Inuzuka, with the enhanced senses, heavy clawlike fingernails, fangs, and ability to communicate with dogs, all of which get slightly more pronounced with each generation. Aburame are probably highly adapted also, but internally more than externally. Shizune, if she really does follow the Inuzuka-with-a-pig pattern, is from a much more recent clan.
c) do something that messes with the Celestial Gates - generally some kind of sealing, either directly or binding a minor demon or spirit in such a way that they feed power through one instead of into the main chakra system. This has the least real evidence, and would have the most varied effects, but logically if you mess with the View Gate in a permanently-altering manner, you get a dojutsu of some kind, and one might guess that while screwing with the Death Gate would be invariably fatal, Snakepants figured out some way to do both Life and Death gates without making Anko abort, and that's why Hotaru can heal or harm with a touch.
In all three cases, the reason the change is hereditary is that it's done before the chakra system has fully formed, and it therefore shapes the life around it, with how well it sticks for the next generation depending on how close a match can be found for a mate - Naruto and an Inuzuka girl would likely get kids who looked like he does semi-transformed by kyuubi chakra (whether that would eb a good or a bad thing is a bigger question, but just being in the company of the DOG clan is probably enough to piss the fox off; ) two doujutsu users are pretty much guaranteed to carry forward one of the doujutsu traits, though unless they're very similar to begin with a combination isn't likely; and the Yamanaka elders are definitely barking up the right tree as far as strengthening the bloodline, wanting to get Ino together with one of the Haruno twins.
Hypotheses, all, presented for the sake of argument and because world-building is fun.
- CD
ETA:
Quote:Well, that was the IDEA, but his soul is kind of bound up wth some others, you know?That which does not kill us... has made its last mistake.
And we're going to get a glimpse of what the Professor was like in his prime? Hot shit.
SERVO: Loook *deeeeply* into my eyes... Tell me, what do you see?
CROW: (hypnotized) A twisted man who wants to inflict his pain upon others.
Next morning, Harry found himself butt-naked in the other side of town, mouth tasting of lima beans. - from Uzumaki Harry by Shadow Crystal Mage
--
"Anko, what you do in your free time is your own choice. Use it wisely. And if you do not use it wisely, make sure you thoroughly enjoy whatever unwise thing you are doing." - HymnOfRagnorok as Orochimaru at SpaceBattles
woot Med. Eng., verb, 1st & 3rd pers. prsnt. sg. know, knows