Name: Yoruko Kurosaki
Age: 17 (GX S1), 18 (GX S2), 19 (GX S3-4), 20 (5d's Dark Signers Arc), 21 (5d's WRGP), 22 (Team 5d's future), and 30 (5d's final timeskip)
Birthdate:  July 15th
Gender:  Female
Looks:  Black hair, black eyes, and pale skin with a near-to-flat chest.  Pic:

That above is basically her but with the red in her eyes and also on her choker, only, are instead black. As for her choker's motif aka the flower, it is instead a skull one. When she wears something formal, it is a blood red dress shirt under a black blazer with a black tie, black dress pants, and black dress shoes.  As sleepwear, she wears long-sleeved black shirts that are a little big on her with one of her black or grey jackets, black shorts, and black socks. Dark blue hat, dark blue goggles, and dark blue scarf that hides her goggles when not wearing it on her eyes.  Yoruko also wears black gloves.

Personality:  Strict, Tsundere, Introvert at meeting new people but the opposite after knowing them for a week.  She will be blushing when complimented or flustered with people finding out she writes fanfiction, which she tries to hide.
Likes:  Dōjinshi, video games, creating new strategies to duel, chocolate, Horror, and Science fiction.  Yoruko loves to write fanfiction about her fellow students and also loves to secretly ship some.
Dislikes:  The opposite and people who think she's high and mighty or weak.

Duel Disk: In 5D's, she has

but in an icy blue color when using her Ice Barrier cards, and then all of it is silver when using Genex cards while it turns silverly blue when using both of these two types.  This happens with Triarm changing the color for their (Yoruko's and Triarm's) Monster allies aka her monster cards.  It behaves like those taken from the Duel Runners, but in GX, it is still the same but more for Academy duels.  She soon gains the one in the fourth season, but retains the icy blue of her previous disk.  Also, the shape of it is a combination of a dragon and machinery.

Deck:  Ice Barrier/Genex
Ace card:  For her Ice Barrier deck, there are three of them:

But her Synchro Monsters become Fusion monsters via Polymerization. For Genex, he's Yoruko's most trusted one that is her main Duel Spirit while Trishula is her other one. Anyway, here's Genex Ally Triarm!!!

Synchro Summoning Chants (For Synchro Monsters):

For Trishula: "Let the spear shatter the frozen wastes!  I Synchro Summon!  Trishula, Dragon of the Ice Barrier!"

Friends:  Crow Hogan, Yusei Fudo, Jack, Carly, Luna, Leo, Akiza, your OC.

Enemies: Dark Signers, and bullies along with villains.
Crush:  Crow Hogan from 5ds
Crush Relationship: Crow and Yoruko met when she lived in Neo Domino for after the Ark Cradle. Along the way, they became close friends and eventually started dating after Crow bested Bashford. When they got older, Crow married her and with her father's blessing.

Biography:  Yoruko was born on a Lunar Eclipse with her twin Ichigo to Isshin and Masaki Kurosaki.  Isshin taught Yoruko how to control her moon sight and how to detect someone's soul.  After her mom passed, Isshin married Ryūken Ishida and Uryū became Yoruko's stepbrother then trained together.  Yoruko got into Karakura High and got bullied until her brothers came and beat her bullies up.  Isshin taught Yoruko how to Syncro summon after she lost her extraordinary powers with her brother until she regained them.  Then she helped her brothers take down enemies and graduated two months after that.  Isshin then told her to go and live in Neo Domino for five years.
Extra: Her Duel Runner is

, her helmet is dark blue with the visor being black, has inferiority complex with her older biological brother.  She has permission by Chancellor Sheppard and Seto Kaiba even, who knows about her Turbo Dueling being taught by Yusei and Crow, to have her Duel Runner on campus, but in a storage container that was shipped to the backside of the female Obelisk Blue Dormitory, as to hide the fact that Yoruko is a Team 5D's Turbo Duelist.  She, like Yugi Muto, Luna, Jesse Anderson, and Jaden Yuki, can see, speak, and summon Duel Spirits, like those of her ace cards.
-----GX Information-----
Dorm:  Obelisk Blue
Reason:  Female and duels great
Uniform: The Obelisk male uniform (she's a tomboy) with the torso, chest and collar colored black while, buckled black cuffs with dark blue buttons and black pants.
Accessories:  Dark blue hat, dark blue goggles, and dark blue scarf that hides her goggles when not wearing it on her eyes.  Yoruko also has some black gloves.
Crush(es):  Aster Phoenix, Atticus Rhodes, Jim Crocodile Cook.

Author's Note: I did this after listening to these songs that have Yandere vibes for this guy:

[There should be a GIF or video here. Update the app now to see it.]

Basically, the character this is focused on is from Yugioh GX and his name is Atticus Rhodes, who is the crush I crave to be played in this book, especially with him Yandere.