I seem to have lost some of my previous analyses, so let's try this again a little briefer.
Suicide Seal: Will kill the user if they are not from the Goketsu clan. They are indistinguishable from other seals.
Not as powerful as it seems; only really useful for killing people who trust us or for poisoning sealing supplies. The latter probably won't work very well, and an explosion seal with a "missing" timer should be at least as effective.
Silhouette Seal
This seal was created by an enterprising Nara in pursuit of a seal that would produce proper shadows for use with their clan techniques. Though it didn't work for that, the Nara recognized the potential of this seal, and with a touch more refinement, produced this.
The Silhouette Seal produces a vaguely-human-shaped shadow caricature. Any interaction with the shadow itself disperses the illusion, as does a sufficiently strong gust of wind. It may be used to give the impression of there being someone there in combination with props, or behind a curtain or paper wall, similar to the Clone technique but without requiring the user's focus.
It lasts thirty minutes, at which point if one is listening closely one can hear a faint keening before both it and its seal vanishes with no trace. This effect has never been successfully replicated in another seal.
We should never have access to this seal :/. Doesn't seem very useful if we don't have a use for shadows, and it doesn't seem like an amazing way to set shadows up either. Storage seals are a lot more flexible.
Double Explosion Seal: It explodes in the same way as a normal explosive seal, but the seal itself is shielded from the blast, allowing it to explode again a few seconds later. Mechanically, it is used like a regular explosive seal but also gives the user next round a tag against an enemy within the same zone as the seal.
*Note, this expands outwards into triple or quadruple explosion seal if you really want to stretch it, potentially letting you set up a zone for free tags the entire fight. Perfect as a Kagome pet project.
This would be better IMO if after the first timed explosion and a short delay (~0.5s) it became a proximity-detecting mine. This would be
extremely useful for Keiko to use as field control.
Seems very hard to abuse, since it's similar to throwing two normal seals simultaneously.
With that change, I love the idea, 10/10. With a mere double explosion, it seems a little hard to use effectively.
Three Seal Paralytic
A three-element seal mostly used in T&I to keep prisoners secure. All three elements are placed on the same plane. A (single) person within is unable to move. The seal keys in on a ninja-sized (greater than approximately 20 chakra) chakra signature to perform its effect.
There are no rumors about a variant of this seal that serves as a trap, combining the effects of Lesser Barrier Formation and Three Seal Paralytic.
The basis for this seal was Five Seal Barrier.
Quick note for
@Vecht: "placed on the same plane" is not a tautology, because seals aren't point objects.
Since it only works on people, this seems pretty hard to abuse. The setup constraints make the combat effectiveness limited, but it could be useful for trapping areas.
Good idea, probably not one we need to be taught.
Greater Barrier Formation
A four-element tripwire seal with effects similar to Lesser Barrier Formation, although instead of triggering on a seal crossing the line, it triggers upon a seal crossing the plane that the four seals make. The seals must be placed to create a square or rectangle between them. The seals, unlike Lesser barrier Formation, do not need to be facing each other (and, indeed, cannot be). It may trigger up to four seals
I like it. Seems hard to abuse, but a useful upgrade.
Greatest Barrier Formation
An eight-element tripwire seal with effect similar to Greater Barrier Formation, but instead of triggering based on movement along a plane, it triggers based on movement within the three-dimensional confines the seals create. It may trigger up to eight seals.
Seems like you should just use perpendicular overlapping
Greater Barrier Formations. Seems a little pointless.
Spurious Barrier Formation
A sixteen-element tripwire seal with effects somehow unlike that of the Greatest, Greater, or Lesser Barrier Formations. Sixteen seals are placed spatially and temporally at the points that would nominally define a regular tesseract, using the Sugimoto metric. It is of dubious use, only barely managing to be classified as a "seal" rather than a "sealing failure." Instead of triggering based on movement, it is unknown what event triggers the seal. This system may trigger up to sixteen seals, and effectively acts as a random timer.
Genius. By which I mean useless.
Unless it allows for time-travel. Then it's broken.
Proposed seal: anything, anything at all which might in any way interfere with stupid stinker cheating bloodline tracking magic.
