What will be needed playerwise will be the guardians themselves. They can be male or female, male that becomes female in senshi form, female that becomes male in knight form or whatever. They need to have a background story connecting them to their respective senshi and how they were chosen for guardian duty. Guardians do not transform with henshin sticks like Sailor Senshi but have weapons imbued with their planets power that allow them to transform. When they are not on their planets they live on earth to stay close to their Princesses. Not only are they responsible for safe guarding the planet, they also secretly guide the Senshi as they grow up on earth.... again... xd
note: you can play twins but no more than one set... otherwise its kinda funky.
Guardians are needed for:
Neptune
Venus
Mars - Twin Knights - ?
Mercury - Sailor Mariner - heneroshi
Jupiter - Sailor Io - Temp-ness
Saturn - Saturn Knight - Light Senshi
Uranus - Sailor Miranda - Roselite Blade
Pluto - Sailor Charon - IkumiAngel
Earth - Sailor Dream - Christica
Episode 1: A New Beginning
The Guardians have awakened and have learned their Princesses are growing up on Earth again. The guardians that have found eachother thus far have met together at Miranda Castle, Uranus, where they are attacked by a scouting party of Titan Senshi sent to find out their weaknesses and to report on the defences of Sol System. Can the new Guardians defeat them?
Episode 2: The one who would not fight
An odd request is given to Sailor Miranda from Two of the Titan Senshi and it seems she is kidnapped. The other Guardians go to rescue her but not all is as it seems and a old friend shows up in an unexpected place.
Episode 3: The Hunted
A lone scout attacks the Guardians and proclaims herself a hunter of weaker Senshi. The Guardians need to prove to this arrogant Titan Senshi that physical strength isn't everything and if thats all you have, you really are alone.
Episode 4: Teamwork?
When Sailors Tethys and Rhea are sent to attack Earth head on it seems to spell doom for the Guardians. Will their teamwork prevail? Will Saturn Knight learn to work with Sailor Charon? Is Sailor Theia really an ally now?
Villainous Titan Senshi (will be available to play if there is a demand, also they are named after actual Titans in mythology):

Sailor Coeus
Actual Name: Eurydice
Element of Influence: The Mind
Target Planet: Mercury
Personality: Cool headed, Indifferent
Actual Gender: Female
Attacks: Coeus Mind Stasis - causes one to become trapped in their own mind, unable to act or move
Status: Deceased - Killed by Sailor Phoebe

Sailor Hyperion
Actual Name: Arietis
Element of Influence: Super heated metals
Target Planet: Mars
Personality: Loyal, Graceful
Actual Gender: Male
Attacks: Hyperion Grand Cross - uses two whips of super heated iron to lash at foes
Status: Ally
Sailor Crius
Actual Name: Linus
Element of Influence: Strength
Target Planet: Jupiter
Personality: Impish, Precocious
Actual Gender: Male
Attacks: Crius Ardent Blessing - increases her own physical strength and speed temporarily
Status: Enemy

Sailor Theia
Actual Name: Iolanthe
Element of Influence: Starlight
Target Planet: Venus
Personality: Childish, Playfull
Actual Gender: Female
Attacks: Theia Starshine Shower - calls down a rain of light that temporarily blinds all who see it
Status: Ally

Sailor Phoebe
Actual Name: Euryale
Element of Influence: Lunar light
Target: The Moon
Personality: Impatient, Hot-headed
Actual Gender: Female
Attacks: Phoebe Moonshine Arrows - launches an arrow from her Cresent Bow
Status: Deceased - Killed by Sailor Io
Sailor Rhea
Actual Name: Dione
Element of Influence: Stone
Target Planet: Uranus
Personality: Maternal, Affectionate
Actual Gender: Female
Attacks: Rhea Stone Cradle - surrounds and encases an enemy in a coffin of stone
Status: Enemy
Sailor Tethys
Actual Name: Atalante
Element of Influence: Rivers
Target Planet: Neptune
Personality: Devious, Manipulative
Actual Gender: Female
Attacks - Tethys Calamity Torrent - Uses the force of a river to push foes back
Status: Enemy
Sailor Cronos
Actual Name: Ixion
Element or Influence: Power
Target Planet: Saturn
Personality: Collected, Leader
Actual Gender: Male
Attacks: Cronos Majestic Law - summons golden wings that strike an enemy with metal feathers
Actual Name: Enemy

Sailor Themis
Actual Name: Enyo
Element of Influence: Law
Target Planet: Pluto
Personality: Enigmatic, Taciturn
Actual Gender: Female
Attack: Themis Final Sentence - takes an enemy to a dimension of Themis's choice
Status: Enemy
KIA: Sailor Mnemosyne, Sailor Oceanus
MIA?: Sailor Iapetus
Status: Currently on Earth, Nuetral?