The Sun is a being of immense power. The light of the sun exposes hidden truths and reaches out to all with its overwhelming strength. The sun cleanses the world. And it allows Justice to directly overpower foes and their attacks.
The Moon is a being that hides and distorts the world. In the weak light of the moon, objects are not what they appear to be. As such, Justice's moonlight allows her to hide an object or person's true self, as well as blur the boundaries what is and isn't reality. Much like how a faint light in the dark can make an object appear to be a monster, so too can Justice's moonlight distort objects. Even when you know what the object is, some of the details can be obscured, and you can't fully understand what you're looking at. In reflection to this, Justice's moonlight has the immense power to distort or outright suppress the powers gain through Trollskap of another. In reflection to how the moon's light is but a cheap reflection, Justice can also copy powers of a target after they've been weakened by the moonlight. Justice's moonlight can also confuse targets by inhibiting coherent thought, similarly to how her Sunlight can inhibit a target's willingness to fight.
The Stars are guidance.
Exposure to Justice's Sunlight will aggressively suppress the will to fight her within others. Even if this sunlight can be overpowered, Justice's Sunlight will begin to physically burn any target that resists this urge of pacifism until they are either forced into submission or burned to death. The harder they resist, the greater the burns. Justice's Sunlight is a powerful defensive magic; Though it can be wielded as a fire-like energy, any "Attacks" created by the energy can only disarm; It will purge and destroy anything that has been created to harm another, burn it or melt it into something unrecognizable. The Sun's energy can act as a powerful defensive barrier, utterly overpowering and turning aside anything that tries to attack into it. By rapidly radiating light from her body, it is virtually impossible to attack Justice, and attempting to do so will only result in an assailant's self-destruction. However, Justice's sunlight does have a weakness--it will prevent her as well from attacking as well until it is disabled. This is because the sunlight's enforced pacifism is unbiased; The sunlight will prevent everyone equally from being unable to attack, and the Sunlight's ability to damage things made with malevolent affects Justice and her allies as well, with the sole exception of her weapon Sannidaiva. Much like how the Sun's light drowns out the moon and the starts, Justice also cannot employ her Moonlight or Starlight while her Sunlight is active.
Justice's Sunlight also wields the power of enlightenment; When exposed to this Sunlight, Justice can (If she chooses to,) cause people to recognize every lie they've ever been told, and what the actual truth is. For example, simply be bathed in the light will cause a child to realize that Santa isn't real. It will also force the child to realize that it's their parents that have been supplying the presents under the Christmas tree. This power of enlightenment doesn't force people to believe what Justice wants you to believe. Merely, it causes you to recognize the unbiased truth, and without Justice's input. It can even cause you to learn things that Justice herself does not know. This power of Justice's Sunlight is useful in two important ways: If Justice knows the actual truth and wants to show it to them, this tool of course is a good way to convince a person that what they believe in is wrong, as this is a direct effect the sunlight has. The second is as an interrogation tool, since the sunlight can allow the target to learn things Justice herself does not know. It's important to note that normally, it's incredibly difficult to lie when exposed to the sunlight in part that lies are usually said with harmful intent, and the primary effect of the sunlight is to suppress all harmful intent.
Moonlight is much weaker than Sunlight. The light given off from the moon, though strong enough to vaguely see objects, is not strong enough to see those objects' true forms. As such, the primary power of Justice's moon light is to conceal the true forms of all that it touches. It's a power that partially focuses on illusion; it can make a monkey appear to be a Sasquatch, or a Building appear to be Godzilla--it's as if the power blurs the boundaries between real life and one's dreams.
When exposed to Moonlight, the mind is affected differently than compared to her Sunlight and Starlight. Rather than insert truth or ideas into the person, Moonlight simply takes them away. More specifically, people exposed to her Moonlight lose the ability to have coherent thoughts--imagine every statement you think about in your head is then met by another statement completely unrelated to the first. First you are thinking about the battle, but then you are forced to think of your parents, then your favorite food, then your place at home--You are physically prevented from concentrating on a certain topic. This Moonlight will therefore quickly begin to disorient opponents, as they cannot focus on the battle. It forces targets to rely on instinct and reflex rather than knowledge, and ultimately forces them to fight only with the coherence of a wild animal, rather than a human. You cannot strategize when you aren't able to think about a plan. If you don't know how her Moonlight works beforehand, you won't be able to gather your thoughts together to figure that out, either.
The power of Justice's Starlight is backed by Righteousness and truth; Her Starlight is primarily used as fuel to preform Magic Attacks, and the strength of these Starlight Attacks are backed by Justice's belief that what she is doing is selfless and right. The more she believe she is fighting for the benefit of the world, the more powerful her attacks will be. This also means, by effect, the more evil or misguided she believes her opponent is, the easier it is for her to draw out the full power of her Starlight.
Her Starlight has the power, when shone onto people, the ability to commune her beliefs and the extent of her righteousness directly into the people's minds. When Justice shines her starlight, it is usually to demoralize her opponents by making them believe that their cause for fighting is unjust or not as well warranted. The power of Starlight has the ability to share her knowledge and experiences to all that receive it. Facts that she herself knows, or even flashbacks of her past will enter the minds of those affected. Her Starlight also has the ability to telepathically commune with targets, as she can insert messages into people using this power.