Canon Abilities
Speed (As Usagi)
Usagi, while not the fastest of the senshi is actually very quick and able to be incredibly fast both in and outside of being a senshi. Since she's late pretty much DAILY, she's constantly running which has caused her to get pretty good at it.
Voracious Appetite (As Usagi)
Usagi can figuratively eat anything and has a massive appetite. To some degree, she's replacing energy taken by using her powers, but that is a very small part. Usagi just really loves food.
Empathic Linking (As Usagi)
Usagi is neither psychic nor an empath, however, she can share visions and emotions with those who carry a Sailor Crystal and also sense people who carry them if she is close to them.
With the senshi, Usagi can sense where they are and locate them,
She can also sense intent and desire.
Usagi is able to do this both in and out of senshi form although she has the strongest empathic link with Mamoru. The link itself may or may not get stronger the more physically affectionate she is with a person.
Disguise Pen (Not Currently in Game - Used as Usagi)
(Not currently in game but if it IS regained:) While not an ability, the Disguise Pen was given to Usagi by Luna so she could disguise herself in order to complete missions more easily.
While she looks like the person she wants to be, she also apparently gains the knowledge of whoever she changes into (though, this is debatable since she rarely is seen using said knowledge). She is completely undetectable unless someone watches her transform or has the ability to see through illusions.
Physical Enhancements (As Eternal Sailor Moon)
Once transformed into a senshi, she has nearly inexhaustible energy. Additionally, she has heightened physical abilities such as running, jumping, fighting, endurance, and strength. Of all the senshi, Sailor Moon is able to endure the worst physical attacks because of her crystal's ability to heal her so quickly and sheer pure will, not because she is actually physically stronger than the other senshi.
She is also the second-fastest of the senshi, being the only one able to keep up with Sailor Uranus who is the fastest of all the senshi.
Usagi is easily able to carry and hold people several times her weight and size as a senshi.
She can also breathe and exist in space without protection and survive the vacuum of space without a spacesuit, additionally, she's able to withstand extreme temperatures both hot and cold, and being underwater. Hypothermia is not possible in senshi form.
Magical Glamour (As Eternal Sailor Moon)
As a senshi, she cannot be recognized by anyone as Usagi unless she tells them or they catch her transforming. Her own father can't even recognize a physical picture of her as Sailor Moon despite being side-by-side. There's magic that protects her identity. Unless a character is able to read souls, energies, or has something that can see through glamors, they are unable to connect Usagi to being Sailor Moon without her telling them.
Flight and Levitation (As Eternal Sailor Moon)
All senshi are capable of summoning wings for flight and levitation separate from their wings, but in addition to this, Eternal Sailor Moon has two sets of wings. Her first set of wings are connected to her uniform that are essentially for decoration, but they can disappear and be replaced by real wings, her second set.
Eternal Sailor Moon's wings are physically a part of her. If they are destroyed, it takes her some time to regenerate them. She can even summon her wings outside of her senshi form if she wills it enough.
With her wings, Sailor Moon can actually fly at super speeds, able to travel across the galaxy and all over the planet. While flying, she can carry others while flying however it's only one person.
Supersonic Waves (As Eternal Sailor Moon)
This is an involuntary attack used only twice in the early days of being Sailor Moon, and only when Sailor Moon had no other way to protect herself. In order to perform this attack, she has to panic and start crying and her odango covers will amplify her wailing until it becomes physically painful for enemies, going so far as to break glass. She has never used this since becoming Eternal Sailor Moon, but she could easily use it again if pushed into a corner and without any means to protect herself and panicked again.
Sailor Senshi Transport (As Eternal Sailor Moon)
When combined with the senshi, she is able to transport across incredibly wide distances such as from the Earth to the Moon in a matter of minutes. This requires at least four of the senshi besides herself to accomplish a transport but in the off chance it can occur in the game, they still would not be able to leave.
Power Transfer, Conduit, and Siphon (As Eternal Sailor Moon and Neo-Queen Serenity)
Sailor Moon is able to transfer some of her power to others. She can't really control how much at this stage in her abilities. Additionally, the one receiving the powers need to have powers of their own in some way for it to work, she is not able to give powers to those who do not have any.
Sailor Moon is also something of a conduit/siphon, she is very easily able to receive the powers of others. Upon receiving the powers from others, she immediately amplifies them with her own.
However, her body IS capable of being overwhelmed with the power causing her to either faint or, depending on how much she gets, cause her crystal to break and kill her/cause her to snap in half out of existence. (See: Lambda Power)
Starlight Honeymoon Therapy Kiss (As Eternal Sailor Moon)
An extremely powerful moonlight-based attack performed by Eternal Sailor Moon and is the third most powerful attack but tends to be the attack she uses the most.
It is able to heal and be used offensively and defensively.
It creates a beam of light that is unstoppable until it hits something or forms a barrier of light that can surround a medium-sized area.
To use as an attack, she uses the Eternal Tiare/Staff which can be summoned by her at any time as Sailor Moon and she can make it disappear when she pleases and calls out the full name of the attack.
When she uses it as defense, she needs only to use her Tiare as a conduit and it will create the barrier.
Starlight Honeymoon Double Therapy Kiss (As Eternal Sailor Moon)
A combination attack performed by Eternal Sailor Moon and Eternal Sailor Chibi Moon. It functions the same as the Honeymoon Therapy Kiss only magnified as it is performed by both Sailor Moon and Chibi Moon. It also uses the Eternal Tiare to form the attack. Unlike Starlight Honeymoon Therapy Kiss, however, it cannot heal people or create a barrier, it can only be used offensively.
Starlight Honeymoon Therapy Kiss (As Eternal Sailor Moon)
This is a supremely powerful light attack. It is even more powerful than the Starlight Honeymoon Therapy Kiss and is the second most powerful attack in Sailor Moon's arsenal. Just like the Starlight version, it creates an unstoppable beam or cascade of light that can both destroy and protect against an enemy. It can also do massive amounts of healing on people and the planet itself. Both the Starlight and Silver Moon Therapy Kiss require the Eternal Tiare to work.
Silver Moon Crystal Eternal Power || Lambda Power (As Eternal Sailor Moon/Sailor Cosmos)
: This is Eternal Sailor Moon's most powerful attack. But to use it will literally snap her apart and kill her each and every time she uses it (until she becomes Sailor Cosmos). It gathers the power of every single senshi in the entire universe and she can then use that power, using her body and crystal as a conduit. It is also called the "Lambda" power. When her body snaps, it releases the ultimate universal Lambda Power, and that power is strong enough to recreate and rebirth an entire galaxy worth of Sailor Crystals and planets
Healing (As Eternal Sailor Moon and Neo-Queen Serenity)
While Sailor Moon is able to heal using the Eternal Tiare, she is also able to heal even without any weapon because of the Ginzuishou. The Ginzuishou or Silver Crystal, possesses tremendous power, and is possibly the single most powerful magical artifact in the entire cosmos of the Sailor Moon universe. It can only be wielded properly by Usagi (though Chibiusa has used it to a much more mild degree and it used to be wielded by her mother, Queen Serenity, though nowhere near the extent that Usagi is able to do so currently).
It focuses on the vital life energy and heart of Usagi. Depending on the clarity of her emotions and desires, it can essentially perform miracles. The crystal is said to be "limitless" and the power is neutral as it is the decision of the wielder on how to use it. It is literally capable of destroying a planet in a matter of seconds or restoring it and healing it.
However, the strain of using such power will cause massive fatigue and even death, as the power actually derives from the life force of the holder. While many have tried to take the ginzuishou from Usagi, only a member of the Moon Kingdom dynasty can actually use it to its full extent, and only with emotional maturity. While she can heal a planet or destroy it, Usagi cannot handle that amount of power without repercussions on her body or energy. While the act of destruction with the Ginzuishou is infinitely easier, it is not in Usagi's nature to use it in that way.
With regards to healing, the ginzuishou is canonly able to bring life to the dead, cure any and all disease, replace limbs, and restore sight to the blind to name just a few of the things it can heal.
It can restore buildings and nature as well. If she pushes herself, Usagi can heal an entire planet.
The crystal also a tiny bit sentient as it can act before Usagi can - or will - protect herself or while she is unconscious.
Purification (As Eternal Sailor Moon and Neo-Queen Serenity)
While usually attached to her act of healing, Usagi's ability to purify objects, locations, and people is separate from her ability to heal them. This is done with light surrounding the object/location/creature and is painless (unless attached to an attack) for the one being purified. Purification is usually attached to her Therapy Kisses or has been attached to more minor attacks, but she can perform purification on its own. She usually uses purification when an enemy is controlling someone and so she has to separate the victim from the thing possessing them.
Immortality (As Eternal Sailor Moon and Neo-Queen Serenity)
The ginzuishou grants Usagi immortality, in the sense that it grants her the ability to reincarnate with all her memories even if her body is destroyed. So long as the crystal is intact, she can be revived. Eventually, as Neo-Queen Serenity, it will grant her full immortality and she won't be able to die regardless of injury.
The crystal can also grant longevity up to a thousand years to others touched by its abilities who don't already possess a Sailor Crystal. However, while the crystal may grant Usagi immortality, it is connected to Usagi and is a literal "crystal heart" of sorts. She can summon it to appear in front of her if she doesn't have it on her, but otherwise, she carries it on her person at all times.
Light Barrier (As Eternal Sailor Moon and Neo-Queen Serenity)
In addition to healing, Usagi can tap into the ginzuishou to protect and shield with light and love. She does this against Wiseman, protecting an entire palace by herself with the light of the crystal. This is a wordless ability and it is achieved by her will and desire to protect. The more emotionally mature Usagi becomes, the more control she has with the crystal. The ginzuishou can also create a castle that can withstand bombs and magical attacks. So... there's that. However, when in this state, she cannot do anything in retaliation nor can she protect herself and then it becomes a "who will run out of energy first?" kind of thing.