Nice avatar btw. As for the Seal, I love this.
You basically create a seal on your body for any element, be it canon or CE that becomes dormant and passive. When activated, it restricts the user to a certain element - the one that is on the Kanji. What's unique about this is only the element on the Kanji and elements that compose it, as well as elements that can be created using the composed elements, are boosted. By choosing a CE, you allow more possibilities with this. A ranks and below are boosted one rank ( passively ) and S ranks and above raised by +20 damage. This allows the elements to deal more damage easily.
Now, questions Just for the sake of them:
1. If used with a CE that is composed of multiple natures, would this allow the CE as well as those base natures to enjoy the boosts granted here? If yes;
2. Would this extend to theoretically KG composed of natures based on the CE seal? Example, if I used a CE that is made of Earth, Fire, Wind and Lightning (doesnt exist as far as I am aware, just theory ), would this mean that Steel is also empowered through this?
3. Would alternate releases such as Sound and Rain also become enhanced? Using the same example as in question 2, would I be able to use the Wind and Lightning to enhance Sound jutsu as well?
4. It states the user can also create this seal in battle if not on his bio; would this be considered a passive activation as well? I believe it's not but the note in the jutsu states that it can be passively activated in battle so I assume it's creation isnt passive?
5. Can a clone activate this and the user be safe? What about a theoretical Summoning that uses Fuuinjutsu?