Porcupine Style - This is Koji's close range combat style that he developed himself. Named after the porcupine that is able to easily detach its quills and lunge them at threats. The style doesn't mimic the moves of a porcupine, but follows the concept of using his Kunai as his 'quills' in close range. The deadly style uses many throws and ricochets in a very close vicinity, the kunai being drawn and abandoned like quills would be. The style uses plenty of kicks as well to maneuver both himself and an enemy to provide more openings to use his Kunai, throwing a handful just after a wheelhouse kick to the ribs. Many opponents have ended close combat with Koji as pincushions.

Supersonic Throw - With a bit of focus and chakra amplification, Koji can hurl a Kunai with enough force that its speed breaks the sound barrier and launches like a bullet. This increases the normal throwing range drastically, to that of like a modern sniper rifle. The drawback is that it is unable to be used stealthily, as the sound barrier shattering makes a loud crack similar to a musket.

Sleeper Submission - Koji knows multiple different holds and grabs based around the neck to cut off air and circulation. An effective way to render someone unconscious.

Shadow Clone Jutsu - Allows Koji to make a few clones of himself with splitting his chakra between them.

Shuriken Shadow Clone Jutsu - An advanced application of the above technique, Koji uses his chakra to clone physical weapons while they are already in motion.

Genjutsu Shatter - An unpleasant technique that is a modification to the standard Genjutsu Dissipation techniques. It uses the same method of disrupting the chakra placed over the victim, but adds a layer of painful constriction on many muscles in the body at once. The physical pain along with the chakra disruption is enough to break all but the most advanced Genjutsu.

Shifting tides of Stone - Putting his chakra into the ground, Koji can make the shape of earth in the area change to his liking. It is too slow to be used as an attack, and the shifts aren't very drastic. He cannot make a slab slowly cover someone and crush them. However, he can easily make domes appear throughout the area with smooth sides, that make it much easier to have surfaces to bounce projectiles off of. While the process of shifting the area is slow, it is very versatile in the shapes it can create. Small spikes can be made across the ground, turning the entire area, if Koji desires, into a field of Caltrops. Some areas of earth can be softened for later modification into traps as well.

Rapid Wave of Earth - A very similar technique to shifting tides, but much smaller in scale and much faster. Near instantly Koji can make the ground spring up a hard, thick wall of earth and rock. This provides him with cover, a surface to use to his advantage, and if he desires the top to be pointed at an opponent, even used as an attack. Using Fuinjutsu along with the technique, he can 'place' the walls to be activated at a later time, setting traps in advance that can be sprung when needed.

Earth Flow Wave - The user creates and rides a wave of earth that can branch off to attack from a distance.

Fall to Rest - A brutal and deadly technique that those caught in successfully have little chance of surviving. Using a combination of Earth Manipulation jutsu and Fuinjutsu seals, Koji creates a pitfall trap under the surface. The bottom of the pit is filled with large spikes, with the sides covered in small, sharp rocks. Along the sides and bottom are multiple Weight of the World tags, placed there with the required scroll for this technique. Anyone who falls into this pit not only is impaled upon spikes, but instantly weighed down by the tags to push them into the spikes without mercy, and prevent them from being able to move. Koji almost finds this technique too cruel under most circumstances, and hopes that the victims are fortunate enough to have a spike go through somewhere that kills them quickly.

Enclosing Technique - Allows a user to seal varied objects into scrolls for later use. Ninjutsu and living things are also capable of being sealed within.

Unsealing Technique - A technique used by shinobi to unseal what was sealed within a scroll.

Sealing Technique: Release - This technique is a counter-measure that can be used to undo fūinjutsu that may be binding the user. By placing their hand atop the seal, it activates, immediately nullifying the effects of the fūinjutsu that may have be cast on the user.

Summoning: Lightning Flash Blade Creation - This is a special "ninja tool summon" that allows the user to seal ninja tools like swords or kunai into a scroll or their clothes beforehand, allowing them to be called upon when needed. The ninja tools can be summoned in an instant just by touching the sealing "marks" which can be drawn anywhere.

Chakra Leaking Palm Seal - A seal that is applied to an opponent with a palm strike. If successfully applied, it will from then on constantly drain the victim's chakra, forcing them to expel it into the air. This can keep going until it causes death if the user doesn't deactivate it.
The technique isn't entirely fullproof once it is applied. While difficult, it is possible for creative or skilled shinobi to overcome the seal through various methods. Not limited to, but some examples could be a dispelling technique. A sudden, powerful burst of chakra could overload the seal. Physically removing the seal in some way would also work, but would likely be very painful.
The most surefire way that anyone could technically use to get rid of the seal, if they know to do so, is to gain a distance of 100 feet away from the one who cast it. At that range, the seal loses its connection and fades away.

Weight of the World Tags - Koji can make tags similar to standard paper bombs, but the effect is much different. When these tags are activated, for a minute, any living creature caught within the 10 foot radius of the tag will suddenly weigh many, many times their own weight. Up to 10 times. Even strong shinobi can collapse under their weight, and particularly weak creatures may even be crushed. Some particularly strong and robust shinobi might be able to move and crawl their way out of it, but it is sure to slow them down.