Like the other scouts, Sailor Pluto has attacks and a transform pen to help her in her fights. In the anime, though, Sailor P. has only one attack she can use freely .

ITEMS

Transformation pen 

Holding this and shouting "Pluto Planet Power, Make Up!"  Meiou Setsuna changes into Sailor Pluto.

Later in the series, she shouts "Pluto Crystal Power, Make Up!" to transform into Super Sailor Pluto

Garnet Orb 

This is one of the three talismans that Sailor Pluto, Uranus, and Neptune have.
They are used to find the Holy Grail.

Time key

Pluto's staff is shaped like a key and is used to travel through time.

Attacks

Dead Scream 

Pluto uses her staff to form a pinkish ball of energy shaped like the planet Pluto and whispers dead scream. Then she fires the energy ball at her target.

Time Freeze*

This is Pluto's forbiden attack. If used, this stops the flow of time for a while.
Using this power will cause her to lose the right to guard the gates of time.
 

*  Thanks much  to MeGaMaN J for this info!
 
 

    Well, let's just say that Setsuna is a very.....private person.When it comes down to it, not much is really known about her in either the anime or manga. She first appears in Sailor Moon S; Chibi Usa, or Rene as many know her, was sent to earth with her crystal key by Setsuna's power. Chibi Usa would talk to her through her Luna P ball and gave Setsuna the cute nickname Puu. From what I can tell, Setsuna cared a lot about Chibi Usa, and even though she may seem like a cold withdrawn person, she cares a lot about her friends. She even used her forbiden power to save the lives of Neptune and Uranus, causing her to no longer be able guard the time gates. Maybe that's why Setsuna is such a loner. It must be hard to guard the gates of time for eternity alone. I can imagine something like that would make a person avoid most social situations.
 
 

    After helping Sailor Moon and the scouts save Crystal Tokyo, Setsuna appears once and a while in future episodes, and one or two movies, but never for a long period of time. Oh, in case you're wondering, Setsuna is only around 1000 years old. Because the job of guarding the passages of time could take quite a while, she is eternal. She appears to be in her late teens.