Just a few techniques to list to people don't get mad at me...
-The manipulation of shadows is very useful; Sayomi can easily imprison an unwary victim if no defense is raised. Illusions that one could see in the shadows would drive all but the strongest of will to insanity. Continued exposure to this is very hazardous to one's health, and often this insanity cannot be cured by any other than Sayomi herself. These shadows can bend others' will, but only by continued exposure.
- A shadow mist-like substance is the greatest embodiment of this will-bending. The Shadow Mist would creep up on an opponent, slowly degrading their will and sanity as the fight continues, usually causing a great amount of stress on the recipient of the technique. Once enough chakra is drained, and the victim has lost enough sanity, the most usual affect of this Shadow Mist is the victim committing suicide, usually in a painful, yet quick manner.
-Her weapons techniques allow her to understand most weapons by simply examining them, usually through touch. Usually the mastery of a new weapon takes a considerably shorter amount of time for her than most others would need. Often times, just one touch is enough to know most of the weaknesses and strengths to most any weapon. Of course, as for the shaping of weapons, if Sayomi attempts to replicate a weapon that has abilities specifically to the original user, these techniques may not be available for Sayomi's use.
-No matter the amount of light (except for extreme concentrations of the stuff...), Sayomi can see perfectly. Not even the small details escape her observant ways. Sometimes, in complete darkness, Sayomi can tell something about a person that they themselves may not know.
- Water of all forms can be manipulated by Sayomi, and the varying temperatures and densities of said element can be manipulated at will. Having such vast chakra reserves, this is a very basic technique that requires very little drain on Sayomi herself. A more advanced version of this water manipulation is, by touch, Sayomi can hear, see, taste, touch, sense, etc, etc anything within range of that body of water. This requires quite a bit more chakra than one would expect, but she has trained hard to be able to sustain this technique for long periods of time. This water technique can also be used with ice, fog, clouds, or water of any form, as long as each particle is within a small distance of one another.
Please note; Sayomi can form quite a few weapons from the shadows around, but the volume of anti-matter used to create the weapon must be the same as the weapon that was being formed from it. Additional shadows can be manifested, usually for extended periods of time. She may have figured out a way to use someone's own shadow against them, but so far has been unable to test her theories on any humanoid creature, though in a contest of wills, it is unlikely that one could best Sayomi, for the tragedy that lies in her past gives her far greater strength than most.
Also, at varying rates, energy can be absorbed into the shadows, making quite a few energy-based attacks either completely ineffective, or simply decreased in power, depending on the users of both techniques.