The Story of Hotaru:

Sailor Saturn appears at the end of SMS. Hotaru is a very weak girl. She only has about 2 friends, Serena and Reeny. Hotaru has this very special healing power that her classmates think are SUPER gross! Sailor Saturn owns a very strong weapon used in, I think, only one of her attacks. Sailor Neptune, Uranus, and Pluto use there talisman in all there attacks, I think.

Sailor Saturn's Powers

I haven't actually seen any of these powers yet because I live in Canada, so I'll just give an answer except I'll rephrase it in my own words.

*SMS Powers*

*Death Reborn Revolution!*
Sailor Saturn says this to destroy the world.

*SMSSS Powers*

*Silent Wall!*
Super Sailor Saturn says this to block an attack from an enemy with her own attack.
*Silence Glaive Surprise!*
Super Sailor Saturn says this to create a huge blast from her glaive.

Let's see some of Hotaru's appearances:

Sailor Saturn
Super Sailor Saturn
Mistress 9
Hotaru