Crilltic's Quick Guide to Rating Enemy Shinobi (AKA the "How Fucked Am I?" Index)*:
*AKA Guide to Chakra and Jutsu in this Quest
Chakra is the mystical life-essence that runs through every living thing. (This is not to be confused with the actual Essence, which is currently only running through one very specific living thing). Mostly, it is used to murder lots and lots of people by villages of magical mercenary wizards (and also one group of magical samurai but we don't talk about them). It is Chakra that lets them casually murder dozens of non-magical soldiers (well, and also their stupid powerful martial arts that don't require any chakra at all, but that's another topic) and bend the laws of reality to their whim. THis guide aims to help you correctly identify just how strong one of the these Shinobi, and hopefully provide accurate advice in dealing with your newfound problem.
First off, there are several tiers of how skilled a user is in controlling and utilizing their Chakra. This is important because it influences how much of the stuff they can bring to bear against you, and also how confidently they can go tell the laws of physics and good sense to go sit in the corner and have a nice little cry. This is all helpfully summarized in one ten-point chart, split into two halves:
Chakra Rating:
The Normal Chart:
0 - You cannot manipulate Chakra. Good luck. Try not to die. Die anyway.
1 - You are a student, or someone who doesn't know what they're doing. You struggle with E-Rank Jutsu.
2 - Your typical Genin. You've mastered E-Rank Justu and can do some D-Rank Jutsu (this is where Tenten currently is)
3 - Your typical Chūnin, or particularly skilled Genin. Can do some C-rank Justu.
4 - The lower bound of Jōnin, also particularly skilled Chūnin and child prodigies. Can do B-Rank Jutsu.
5 - Your typical Jōnin, most medical-nins are here as well even if they don't usually fight. Typically have some A-rank Jutsu in their bag of tricks, maybe even an S-Rank Jutsu.
The "You're so fucked" Chart:
6-10 - Above 5 is where you start getting to the heavy hitters. Your famous Jōnin, your Sannin, your Kages, your S-Rank Missing-nin. They have S-rank Jutsu in their arsenal, all which will probably do very unpleasant things to you if they hit you, and their other skills are such that unless you are also on this list they will hit you.
If you're fighting someone who is 7 or up, basically your recourse is to bend over and kiss your ass goodbye. Because you're about to be dead very soon (or depending on the Shinobi in question just wish you had died quickly).
Chakra Pool:
Now, that all skill is useless if you don't actually have any Chakra to use. Which is where your Chakra pool comes in. Four things play a role in how large your personal Chakra pool is. Your physical stamina, your mental toughness (Willpower), Genetics and your Chakra Skill. In short, your Chakra pool is equal to:
Chakra Pool = Chakra Rating*(2*Stamina + Permanent Willpower + Genetic Heritage^) x10
^ Generally a poor genetic background is ~2, average is ~7, highest is typically ~12. Tenten has a genetic marker of 6, so slightly below average.
Completely exhausting your pool of Chakra is generally considered a bad idea and can lead to the following symptoms: Fatigue, Numbness of Limbs, Headaches, Dizziness, Fainting Spells, Coma, and Death. Likewise, as physical and mental resilience are important determinants of a person's chakra potential, if a person is physically or mentally exhausted or incapacitated they can find it difficult to impossible to utilize the chakra in their bodies.
Note: Because Tenten is an Exalted, and therefore bullshit, she can avoid chakra exhaustion by using her essence pool to recharge her chakra reserves at the rate of one mote for 10 Chakra. It is a desperation move, because it is horribly inefficient, but you know, better then falling unconscious.
Elemental Affinity:
There is also the Elemental Affinity. Some jutsu are divided by their elemental nature. Every person has an affinity for one of the Five Elements. (Fire, Water, Wind, Earth and Lightning). A person has an easier time learning and using Elemental Jutsu within their affinity (Justu cost 20% less XP to learn and use 20% less Chakra when casting). Tenten does not know her Elemental Affinity.
Justu:
There are four main types of Justu covered here.
Ninjutsu: Primarily defined by "It's not any of the other Jutsu". Ninjutsu uses Hand Seals to manipulate Chakra in order to accomplish all sorts of things. Either way, Ninjutsu is one of the two Jutsu types to use the Chakra skill (the other being Genjutsu). Ninjutsu is split up into six Ranks (E through S). Currently Tenten is capable of learning E and D rank Ninjutsu (provided she can find some to teach her)
Genjutsu: The art of using Chakra to manipulate an opponents mind. The other Jutsu to use the Chakra Skill. Much like Ninjutsu it is split into six ranks. Tenten can learn E and D rank Genjutsu (though E rank Genjutsu don't exist). However, she currently does not know any. Additionally, the Chakra skill serves in this instance as a defense against Genjutsu.
Taijutsu: Unlike Ninjutsu and Genjutsu, Taijutsu is all about the physical body. It does not use Chakra extensively (though some fighting styles do use Chakra to augment the physical body). Instead, Taijutsu takes the place of the Martial Arts skill. Because Fighting Styles are busted, besides, it's not exactly like there's anyone to teach you them.
Fūinjutsu: The art of sealing. Seals work differently than the other Justu, in that they are custom techniques. You can either follow preset recipes with various component parts to do various things, or build your own techniques from the various seals Tenten knows. Tenten's specialty is seals, which is why she's able to do this. I'm still working on finalizing the Fūinjutsu mechanics, so please be patient with that. Fūinjutsu replaces the Linguistics skill. (Yes, I know that will require modifying many of the charms there, and yes, I'm working on it).
Finally, any questions?
Bonus Rules Edit: This is something I forgot to add earlier, and I doubt it will be particularly relevant but.:
OMAKES:
I do give rewards for Omakes, and other player created content. Provided I feel it is of suitable quality to merit a reward. If it is, I will treat it the same as the benefits of a 3d stunt (AKA +3d, 1 twp or 6 motes and +1XP), where the author or artist can apply whenever they wish. Only one omake bonus can be applied at any one time.
Double Edit: I should also state this is subject to revision as well, if I find any glaring holes in it as the Quest progresses.