Full name: Samadaya Zenbu (Zenbu being her clan name)
Age: Lived for centuries, but appearance wise, is in her early 20's
Eyes: Naturally bright purple (it's a hereditary trait, doesn't hinder her vision at all), turn red with black pupils with the symbol of Nibiru on them when she uses her Eyes of Nibiru
Height: 5'8
Weight: 120lbs
Fashion: Likes to stick with traditional Zenbu clothing, which is pretty much any color of yukatas/kimonos/ or short sleeve shirts with a haori over it. Usually lets her black hair just flow around, but she'll tie it into a low ponytail sometimes.
Weapons: Keeps a katana without a handguard sheathed across the back of her hip, and a folding iron war fan tied to her wrist.
Abilities: Utilizes the Marluxian Arts, a set of powers associated with each of the planets/heavenly bodies. There are powers based on fire, water, electricity, organic material, intangibility, speed, and a bunch of other things. Her previously mentioned Eyes of Nibiru allow her to instantly teleport to any point in space, as well as open up portals. Other Nibiru powers are based on life and death, and allow her to bring people back from the dead among other things. Though, that requires preparation (a proper sigil, a corpse in good condition for the soul etc)
Personality: Being a descendant of the prestigious Zenbu clan, she is very proud of her bloodline's legacy and is fixated on reviving her clan. At the same time, having the power of Nibiru set her apart from just about everyone else in the world, so she also views herself at a higher level than her own clan.
She was quite literally the most powerful Marluxian Arts user that ever existed, and she knows this. However, she always shows respect towards strong opponents, or people with a good set of values and discipline. She doesn't let her strength lead her into battle without properly analyzing the situation first.
Has an elitist and hateful attitude towards humans. Kind of a long story about this, but her daughter grew up to destroy humanity and create a new generation of humans, ones who did not grow to know the power of the Marluxian Arts. It's the new generation of mankind she hates and the old one she longs to bring back

Hardened by war, so has no problem killing. Though, she still maintains a sense of humor and will crack jokes and laugh if she's having a good time. She also loves her alcohol and is the kind of drunk who likes to do really dangerous things
Specific Moves: Some common combat moves are the Crimson Serpent of Mars, a giant snake made of fire she summons from her sword. Majestic Wind, which is summoned from her war fan. She swings her war fan, causing the wind to pick up her enemy before the current grows violent and rips them apart. Blade of Mars, which is actually really basic. She transfers heat to her blade, and it will sear flesh as it cuts, letting her cut limbs clean off

Sparks tend to fly with every swing
Combat Type: Eh, she's pretty good in any situation. The Marluxian Arts allow her to excel in close, mid, and long range engagements. I suppose her go-to style in close combat, long range if she's dealing with an army, and then back to close/mid as she breaks up their initial formations.
Special Moves: Jupiter Archangel, for one. With the Art of Jupiter, one can make a force field. Samadaya cleverly uses that energy to make a colossal figure modeled after a special military unit of the Kingdom of Jupiter, and uses it to, well, kill people en masse. A sword and shield are made from the same energy and those can usually shatter mountains

Just think of it like a huge neon samurai, I suppose.
Her other special would be using her Eye of Nibiru to summon the Forbidden Statue, which contains the Great Destroyer in it. Another long story, but the Great Destroyer is a colossal humanoid demon with 2 faces and multiple eyes and arms. As you can guess, it's magnificent at destroying things and nearly caused the end of the world in her respective story. Speaking of which...
Story Name: 6 Cataclysms.
Speech Example:(introducing herself, which takes place during a war)
Samadaya placed her hands on her hip and stuck her sword into the earth as the Great Destroyer roared in the distance behind her.
Samadaya: My name is Samadaya Zenbu, Daughter of Jupiter and Disciple of Great Lord Nibiru! I declare here and now that all of you, every man, woman, and child, will be eradicated, turned into dust and swept away by earth's winds!
(speaking with the enemy (The MC of the story)
Samadaya: You're a wonderful spirit, Hita. That much I can see in you. But what you can't see is the truth. My daughter lied to you, used you, and led you to your death. It was Agzabah that ultimately killed you. It is only by Phaedra's pleas for your safety that I haven't killed you already. For her hard work, I owe her that much.
Hita: You had her do all of this? The 4th Cataclysm, the Syvian massacres...she did all of that?!
Samadaya: She's so much like me that even I'm scared by it. But yes, it was all her. It is by her obedience and determination that I live once more, for the first time in millions of years. And now, I am going to bring in the 6th Cataclysm, the end of humanity as you know it. I suggest you stay out of the way, lest Phaedra's darling descendant is killed in the crossfire of a war he doesn't understand.
(talking to husband)
Samadaya: Darling, please don't lecture me about traditionalism. You know how much I hated some of the Zenbu's customs.
Dharja: I know, I know, but we've got to be on our best behavior for the ball. There's going to be a lot of Zenbu nobility there. Even some folks from the side branches are going to be there.
Samadaya: No one cares for the side branches, love. That's why the Io clan got pushed away from the capital and eventually wiped out.
Dharja: Please don't bring up the Io clan again. I was tricked into doing that.
Samadaya: Aww! You're not as cold and brooding as you let on! You're a softie little cutie pie on the inside, aren't you, Dharja Warja!
Dharja: Don't be ridiculous...
Her speech pretty much molds around the situation she's in.
Weakness: Though she is "immortal", she is not indestructible. Nibiru only stops one from aging any further and dying of natural causes. It does not mean she can fall from a cliff and survive, or take a mouthful of flechette rounds and walk it off. Though she has a large array of attacks and moves available to her, if you can manage to get a fatal hit on her, you can kill her right then and there.
In order to perform the Marluxian Arts, she needs her hands. You need to clasp your hands in order to use the planetary powers (except for powers stored in the eye, like Nibiru). Sever her arms, and you've just taken away a lot of her abilities. If she can't heal herself after that, she'll exsanguinate and die. Same goes for the eyes. Take those out, and you've stripped her of quite a useful moveset.
Reality: Can't say I understand this concept too much yet. I'll have to read up on it more. My problem is, if Samadaya hates humans so much, wouldn't she try to kill everyone in the same reality as her? Unless I can give her a reason not to. Like, maybe she already conquered the world she was involved with in 6 Cataclysms and has no need to take over any other worlds in the realities.
You know what, let's just go with that. In that case, I guess I'd put my money on R6