The series frequently refers to Usagi's Senshi identity, "Sailor Moon", as the "Soldier of Love and Justice", and once as the "Soldier of Mystery". Her uniform, originally colored blue and red (or dark pink), with a crescent moon motif, gradually changes to incorporate more pink and yellow and adds a heart motif as well. She also wears red hairpieces and white barrettes resembling feathers, both of which can be used for minor attacks. Her personality is no different from when she is a civilian, although certain powers are unavailable to her in that form.
Sailor Moon's attack-names center around the moon, love, mystery and light. She starts out as a frightened, reluctant girl, and others often have to bail her out, but she gradually comes to accept her full identity. She eventually becomes the most powerful Senshi in the galaxy, but her capacity for caring about other people is frequently shown to be more powerful still.
As she grows stronger, Sailor Moon gains additional powers, and at key points her appearance and title change to reflect this. The first change takes place during the third major story-arc — Act 30 of the manga and Episode 111 of the anime — when she obtains the Holy Grail and becomes Super Sailor Moon. Her uniform becomes more ornate (see top of page), and her powers are increased; at first she is unable to take this form without the Grail, and is weakened when its effects fade. Near the end of the S series, she takes this form using pure desperation and the powers of the other Senshi after the Grail has been destroyed. Later, in Act 34 (episode 128), Pegasus' power enables her to transform without it.
Sailor Moon receives her third form at the end of the fourth major story arc (in Act 41 of Dream in the manga, and Episode 168 of Sailor Stars in the anime). The combined power of the other members of the Sailor Team transforms her into Eternal Sailor Moon, whom Diana says is the closest in power to Neo-Queen Serenity. Her uniform is even more radically altered—most significantly, two pairs of angelic wings adorn her back. They replace her standard back bow as they are attached only at the waist and are in the shape of a large bow.
In the manga, Eternal Sailor Moon uses the Silver Moon Crystal (an evolved form of the Silver Crystal) to carry out her attacks. In the Sailor Stars anime it's less clear whether the crystal she is using is still called the Silver Crystal. The names of the attacks are congruent with the manga, which uses the name of the new crystal, but the crystal is not clearly given a new name.