Beyond the kuiper belt, there's one mystery planet that the rocky and gas giants planet was not seen before. Her orbit is calm, with some chatting sounds from the dwarf planets and their moons. Neptune would see her from time to time since he's the closest to her.
Most of her moons are young and fragile, one hit from an asteroid and they would be destroyed. One of her moons, Natasha, the biggest moon, was sworn to protect her siblings when her planet was not looking.
Their planet is violet colour with a scar on her left side and she lost her left eye. She has faint but obvious rings which caused from the outside moons who attacked her moons, hence where she got her scar. She's an ice giant where her ice didn't get much sunlight. Her gravity is very strong, stronger than Saturn's. She is about the size of Jupiter.
One day, Vanessa, the smallest sphere moon of the planet, wandered around the solar system. She's new and much to her displeased she would rather stay with her planet.
She tried to stay hidden, but was still founded by the moons of Uranus.
"Hey! You there!"
Vanessa stops her track and looks for the sound. She saw a moon that was smaller than her with a grey colour. "Yes? Do you need something?"
"Who are you? We didn't see you before." Titania asked. She swore that she didn't see a moon with that kind of colour in the solar system.
Vanessa is an orange colour of the moon where the only one with that colour, and she's bigger than Callisto. So when the moons of Uranus saw her, they got confused with her as a planet or a moon.
"I've been here several times already." Technically, she went here with her older sister before, so she's just remembering the route they took last time. "Mind your own business, Titania. You wouldn't want to get my planet's bad side if I were you."
"How did you-"
Vanessa quickly zoomed past her and arrived at Jupiter's orbit. She glanced around her surroundings and went in the astroid belt without anyone noticing.
"Hey Ceres! Nice to see you again!" Vanessa greeted.
Ceres giggled at her and floated around her. "Ni-ice t-to see y-you!"
"Here! I got you another pretty asteroid away from the kuiper belt."
"Tha-ank yo-ou!" Ceres smiled.
"Anything happened in the inner planets?" Vanessa asked while looking at the rocky planets interaction.
Ceres shake his sphere.
"Well then, time to head back to XXX." Vanessa shrugged, and turn her head back to the direction where she came. However, she was blocked by a Saturn's moon.
'Okay, this one is green and the same size as second sis... What's his name again? Oh yeah.' she thought. "What do you want, Titan?"
Titan widen his eyes with shock. "How did you- nevermind that, where did you even came from?" He asked.
"I'm royal to my planet. I'm not going to spill secrets, especially to the moon of Saturn." Vanessa crossed her arms.
Titan raised one of his eyebrow, "what's wrong with me being the moon of Saturn?"
"I once heard from my sisters that I have a younger brother that smaller than me, who got lost between Jupiter and Saturn's orbit. Saturn turn him into his rings by accident." Vanessa slowly floats away from Titan.
"I'm sorry?"
"Don't say sorry for your planet, they never realised how bad they are." Vanessa slightly turn her head back. "We saw what happened in the moon revolution, Titan. My planet was not happy about that after Ganymede tried to gather my little siblings to fight an innocent life planet."
With that, Vanessa left the astroid belt and heading back to the kuiper belt. Leaving Titan confused.
"Hey Vanessa!" A giant darker blue planet come into her view.
"Oh hey Neptune!" Vanessa waved at him. "How's the kids?"
"They are good! Triton has been taking care of them!" Neptune smiled.
"Neptune are you talking to Guillermo again?"
Vanessa turned her head back and saw Uranus. "Oh hey Uranus." She waved.
"Hey there Vanessa, how's... your planet these days?" Uranus asked.
"She's good. We've been talking to the dwarf planets often to make sure no threat come." Vanessa shrugged. "Olivia have been taking about a planet she seen far away from here, we tried to talk to her but she said she got it."
"Well, make sure to look clearly since she lost an eye!" Neptune said, spinning around.
"And take care of your sisters and yourself, Vanessa." Uranus said.
"Will do!"
Titania watched them all along, 'Vanessa...' she turn to Uranus, "who's Vanessa?"
"One of the moon of the planet beyond the kuiper belt." Uranus glanced at the kuiper belt. "She's... My sister and my teacher."
"What's her name?" Ariel asked.
"Uranus, we promised not to mention her name." Neptune slightly bumped into Uranus.
"Yeah... You're right." Uranus turned to his moons, "sorry mates, looks like the secret is not out of the bag yet."
"Aww..."
~~~
"I'm back...!"
"Welcome back, Vanessa. Do you have any intel?" Natasha asked.
Vanessa shrugged, "except for meeting Uranus and Neptune on the way back, I met Titan in the astroid belt while my meeting with Ceres."
"Titan, huh..."
"That moon gave me a weird impression, ugh." Olivia, the third moon, showing a disgusted face.
"Olivia, you shouldn't say that to the moon of Saturn." Natasha said.
"Why can't I?" Olivia crossed her arms. "I say whatever what I want to."
"Olivia, you shouldn't speak like that to the other moons." XXX said.
Olivia lowered her head, "sorry XXX..."
"Now don't give me that face." XXX slightly pull her sphere up. "The moons of Saturn was never my favourite, you girls know this at the very beginning."
"Because they killed our brother?" Vanessa asked.
XXX nodded her head. "Yes, that."
"XXX! Can we meet other moons like Luna or Phobos and Deimos?" Cassandra asked. "I've been dying to meet those moon!" Cassandra, the second moon of XXX. The most energetic moon.
XXX glanced at the inner planets and turn to Cassandra, she sighed. "Alright, but you have to get someone to accompany you."
"No worries! Vanessa can accompany me since she hasn't met lots of moons!" Cassandra dragged Vanessa's arm.
"Cassandra. Be careful of your words." XXX warned. "Earth may be stable for now, but he still scared of larger moons."
"Mercury has been giving him therapy though, hasn't he?" Natasha asked.
"Like I said, stable for now." XXX sighed.
"Let's go Vanessa! Maybe we could get Triton on the way!" Cassandra dragged her. "We'll see you later, XXX!"
"Have fun, girls."

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The Ninth Planet (OC Planet)
FanfictionBeyond the Kuiper belt, there's a certain planet that humans were not aware of. Her orbit is similar as Neptune, but saner than him. She has 4 big moons, and 6 little asteroid-like moons. Who is she? [Planet and the moons are my Ocs] [Timeline Oc pl...