Characters in this story are
Sun
Vulcan
Mercury
Venus
Earth
Luna/moon
Theia
Mars
Phobos
Deimos
Ceres
Jupiter
Ganymede
Europa
Callisto
Io
Elara
Amalthea
Saturn
Titan
Dione
Enceladus
Mimas
Rhea
Iapetus
Tethys
Hyperion
Uranus
Titania
Ariel
Umbriel
Miranda
Oberon
Neptune
Titron
Naiad
Thalassa
Despina
Galatea
Larissa
Hippocamp
Proteus
Pluto
Charon
Nix
Styx
Kerberes
Hydra
Haumea
Namaka
Hi'aka
Eris
DysnomiaÂ
Makemake
S/2015:136472:
Planet X
Ships:
Sun x Mercury
Theia x Mars
Luna x Titan
Jupiter x Saturn
Ganymede x Europa
Titania x Triton
One-sided: Titania x Titan
One-sided: Earth x Theia
Vulcan x Theia(They dated In the past)
That's its for the introduction