All those charts and stuff

The history of the two condensed:

-A piano was made in 1392

-Twenty years late (1412), it was destroyed in a fire.

-The piano was split in half, into two ghosts

-The ghosts take the forms of human twins

-They stick around to play the piano.

-Ori only appears in duets or as the harmony or whatever, due to his laziness.

(I'm working on a short story for this too. It will make more sense.)

Name: Abscissa Pianone
Age: 618, appears 20.
Birthday: April 2, 1392 (Died 1412)
Gender: Technically ungendered, but appears female.

ALIAS: Absci (A nickname)

Name Meaning: (Abscissa is the x-coordinate in math, the name is just for a name.) Piano sound
Character Item: Colorless sakura, other
Likes: order, perfection
Dislikes: disorder
Personality: She acts like the older sister, though there is no proof. She is strict with Ordinate. She is somewhat OCD, and a perfectionist.

History: She is half of the ghost of a piano that was destroyed in a fire twenty years after being made. She isn't a poltergeist, but sticks around to play the piano. She is said to take the form of a black haired girl with a piano-like theme.

DOWNLOAD: Side bar.

Name: Ordinate Pianone
Age: 618, appears 20.
Birthday: April 2, 1392
Gender: Technically ungendered, but appears male.

ALIAS: Ori (A nickname)

Name Meaning: Ordinate is the y-coordinate, but it's just a name. Piano sound.
Character Item: Colorless sakura, other
Likes: Relaxation
Dislikes: Chores
Personality: He tries to act older, but it is unsure which of the two is. He is laid back.

History: He is the other half of the piano that was destroyed. He is the bass clef player, but on occasion, he can play bits of the treble clef. He is said to appear as a black haired boy/man with a piano-like theme.
DOWNLOAD: Usually just when it's a duet with Absci, or he plays the harmonies or whatever.

Related Characters:

Shizu Sogone (Colleagues)

Aroku Senna (Colleagues)

Kotori Sod (Shizu's boss, in charge of the entire branch. She comes in contact with the two.)