Kitti- he's somewhat hybrid, he's a diamond that got a bit mix with gem. He's supposed to be new Red diamond after the original RD 'pass away'. The gems had thought this new diamond would be more  worse then the original, so they made rebellion against him before he could even start ruling, resulting his diamond eye getting cracked. He still works perfectly fine however he does glitch out if having panic attack.

Zmeya- she's just like Kitti, her gem somehow got mix with diamond.
She was made to serve the diamonds but instead became a bodyguard for New Red diamond after seeing how skillful she is.
She made sure she stay by New RD side and keep protecting him. she did have brother-sister bond with New RD.
After the Rebellion incident, she was psychological damage, you can easily tell by looking at crack on her leg.

Tiffany- She half human, half gem, she was raised by the Crystal gems.
She's still in training, but time to time, she would cost a bit of trouble.
She have no clue who her biological parents are, only heard stories about her bio dad being a great warrior but her bio mom on other hand... All she knows is that her mom abandon her.

(If your oc's Tom's kid being hybrid like Tiff, we could use that Theory about mystery girl being seven sister or there could be another look-like Tom gem.
Whatever way you wanna work it out)

1.) (Homeworld)
You, Kitti and Zmeya were into hiding, why?
Well, ever since that rebellion incident, the diamonds decided they shouldn't have try replacing the original Red Diamond. So they're going try shattering the New Red Diamond (Kitti) but before they could do that, you and Zmeya took him into hiding.
It's been years since you all went into hiding... Until now.
When the soldiers gems find you three, you all now a run for it.
You soon found a ship, you quickly told Kitti and Zmeya to get on.
Once they were, you immediately started it and try to drive that ship outta of the planet as fast and far as possible.
Once you guys were far away enough, you relaxed a bit but now here's a new problem, where are you guys going to live now?
Homeworld was only place you have known as home...
Everyone was quiet for a bit until Kitti speaks up "H-hey... I might know a place we could stay.. I h-had a friend who told me about this place but... I dunno if they're there o-or if this place does really exist..".
You thought about it for a moment. Why the hell not, you three have nothing to lose...
So you drive the ship to earth...

2.) (Earth)
You and Tiffany were just hanging out after Tiff finished training.
As you two talked, you noticed this weird shooting star was oddly getting close... Until you realize it's no shooting star..
It was a spaceship...
You and Tiff watched that thing crashes into the woods, you both look at each other for moment before quickly running over to the woods.
As soon you and Tiff got there, you two saw two gems getting out the ship, one looks to be a boy with grey skin and other one a little girl with pinkish skin.
They both were looking around until the grey boy see you two "Oh! H-hello! Can you um two help us?".
Tiffany looks at him wary, you on other hand looked at him confused and asked "um, what do you need help with?".

"Um this is hard to explain but we're looking for someone, this is how they look" the grey boy said as he took a picture out of his pocket and show it to you and Tiff
(Heres the picture vv)

You looked at this confused, you knew who this is but you didn't know how these two know them.
Tiffany was quiet for moment before she finally speak up
"I know them... But we gonna find Judy and Tord first..."
What do you do?

3.) Make it up