How many tails can a host manifest before mastery is achieved...
We could just keep the old system.
Or, I guess we could complicate it because some of the tailed beasts don't feel like being compared by the # of tails regarding strength and mastery.
Here are the things that need to be mastered:
~ Elemental natures of the beast
The 1 tails has magnetic release, for example, a KG of 2 elements. Someone who does not have the pre-req elements will take more time to train than a beast that only has a single affinity to master.
~ Chakra Cloak V2
It offers more protection than the initial form, but it's actual strength tends to depend on the tails.
~ Initial Form
Pretty easy, this one should practically be automatic granted.
~ Tailed beast Transformation
The highest level of mastery no matter the system. It should be the last thing that is mastered.
~ # of tails manifested corresponding to the amount of chakra drawn out
This is clearly going to be tier ranked, with the 1 tails having fewer tails to master and the nine-tails having the most tails to master.
So, we'll have to split this up Congress style again I guess:
Tailed Beast Mastery divided into two parts:
Chakra Capacity Access Chakra Control
1) Chakra Capacity Access - A host will gain access to the next level of the tailed beast's chakra gradually, regardless of the seal in place. Originally, the host will have access to just enough of the beast's chakra to use passive abilities (like nightmares for 1-tails or healing for 9-tails).
Next tier, the jinchurikii gains access to enough chakra to enter the initial state. The user will continue to unlock tails until they gain access to enough chakra to use 1/2 of their beast's total tails. At that point, they unlock the v2 state, which can only be access from 1/2 tail power and up.
2) Chakra Control - A host gains control over the chakra initially just enough to suppress it when emotions get slightly heated. The next tier allows the host to begin calling upon the chakra at whim up to the tail chakra capacity that they are permitted at the time.
Next, depending on the elements possessed by the beast, at this stage the host must either learn the new elements from scratch or become accustomed to combining them together; hosts who share a KG with a tailed beast automatically gain control over the beast's elemental affinities, but cannot use more of the beast's chakra for said affinity than they are allowed through chakra capacity.
Next the user gains the ability to control the v2 form cloak without going berserk. Then the user gains the ability to perform partial transformations. Finally, the user is able to fully transform into the tailed beast without losing control, but as an additional prerequiste, the beast must either be compliant or properly subdued for this stage to be achievable.
Things that can augument and/or speed up these stages:
~ Having a chakra nature that is the same as the beast.
~ Sharingan (for "convincing" the beast to help you)
The times for each stage I'm drawing blanks on, so I"ll just leave that up for now for commentary.