Throwing around more research ideas (not intended for the current vote):
Zephyr Field Rune
Projects a peculiar field that dramatically heightens chakra diffusion. The practical effect of this is that coherent chakra emanations, of the kind needed to utilize ninjutsu or genjutsu, are impossible to guide or focus unless very close to the controller. Chakra that goes out of control due to this effect tends to do so violently. Casting a fireball backfires severely and armor jutsus become unstable, but things like chakra adhesion, chakra-boosted taijutsu, and good ol' kunai still function as normal.
Seals and other runes that depend on chakra for anything more than extremely short range effects have their effective range cut down, with varying results. Seal and runes that do not depend on chakra for their effects are unaffected. Naturally the field disrupts many sensory abilities that rely on chakra detection.
Chakra Screen Rune
Creates an invisible rectangular barrier that chakra cannot pass through. Physical matter passes easily, though this is quite harmful to living creatures. The barrier is itself a chakra construct and can be dispelled with repeated attacks like other barriers.
Chakra Crystal Rune
When active, can be fed chakra up to a certain capacity which it stores in its internal structure and protects from dispersion. Can be deactivated to release the chakra into a fixed shape.
Gentle Storage Rune
The successor (or ancestor?) of the storage seal, the theory is far more complex but opens the possibility of eliminating all damaging stresses when storing objects. It also endures many more uses.
Blink Rune
Adapts the effect of vanishing seals and can affect multiple objects that are directly or indirectly touching the rune in a radius. Vanishes and reappears on a cyclic timer until the rune's power runs out.
Live Storage Rune
Stores an object, even a living one with an intact chakra system. In the case that esoteric rune theory alone cannot overcome the normal limitations of storage, tries to do so with a hacky solution such as folding space like a vanishing seal. Another hacky solution is for it to screen the chakra contained in the target to be stored physically with the rune, while the chakra-stripped object is then put into storage. Upon release, the stored chakra is restored to the object in the same arrangement it was before. May or may not be lethal to a living creature depending on how well it reconstructs the chakra distribution and the timing of this restoration. At least the body will be pristine.
(the below are more memes/aspirational goals than serious ideas)
Legacy of the Whirlpool
A special Arena rune and set of seals. When the rune is activated the rune and all corresponding seals and their tagged objects are shunted to another dimension. Unlike storage, time does pass in this dimension and the rune can be activated again to return to the original position. In case of obstruction will find free space to appear at, with unpredictable results. Is the alternate dimension survivable? Ask Whirlpool.
Hidden Heaven
Rune that shunts an entire bubble of matter into another dimension. Yes this leaves behind a vacuum. Fuck this world, let's lighthouse.
