How do summoning jutsus work?


Let's have a back drop on the story, the Third Hokage shows Jiraya, Tsunade,
and Orochimaru his summoning technique. This intrigues Jiraya and he too tries
to perform the jutsu without making a blood seal with an animal. As a result
he is teleported to Mount Myoboku, where the Toads live. He trains there for
some time.

Here lies my first question, until later into his training Jiraya had not made
a blood seal with the toads, so how did he get to mount Myoboku to undergo his
trainings? The reverse kuchiyose should only work when there is a blood seal
with the animal. Going to Mount Myoboku on foot is a long and tiresome
journey, so this possibility too is cancelled out. So, in order to go to Mound
Myoboku did he use the kuchiyose no jutsu every time?

My other question is what decides which animal a shinobi is to bond with?
There is a wide range of creatures that one can choose from, but certainly
there must be some sort of compatibility to be worried about. What made Jiraya
decide a toad summon would be best for Naruto?

Has anything that can substantiate the above points been mentioned in the
manga?




Nope, it isn't explained at all.

The background you described is 100% filler and was never described in the
manga, so using the Summoning Jutsu without a blood pact doesn't necessarily
teleport you randomly.

As for which animal is suitable for which. Jiraiya seemingly decided to give
Naruto the frog contract because he had the contract himself, (not to mention
that Naruto's father, Minato, also had a blood contract with frogs).

I don't think there's a requirement of any sort, but that's just guessing. The
entire technique is cloaked in mystery.

See my answer on this other question: [How to summon a different animal using
Kuchiyose?](https://anime.stackexchange.com/questions/756/how-to-summon-a-
different-animal-using-kuchiyose/763#763)




Nope, it isn't explained at all.

The background you described is 100% filler and was never described in the
manga, so using the Summoning Jutsu without a blood pact doesn't necessarily
teleport you randomly.

As for which animal is suitable for which. Jiraiya seemingly decided to give
Naruto the frog contract because he had the contract himself, (not to mention
that Naruto's father, Minato, also had a blood contract with frogs).

I don't think there's a requirement of any sort, but that's just guessing. The
entire technique is cloaked in mystery.

See my answer on this other question: [How to summon a different animal using
Kuchiyose?](https://anime.stackexchange.com/questions/756/how-to-summon-a-
different-animal-using-kuchiyose/763#763)

