I'm pretty sure you can create as MUCH as you want. This is a fun topic. Hey, if it gets popular enough, it might get a sticky.
Name: Christina Sheppard/Ai Samejima
Age: 23
Nick-Name: "Cyber Goddess", "The Next Bandit Keith"
Occupation: temp-resigned Pro League Duelist. Studing in Grad School (By internet) to earn a Ph.D in dueling.
Bio: Daughter of chancellor Sheppard, she was also once in the school of Cyber Legacy/Cyber Ryu. She was the only one Zane couldn't beat during those days in the past. Although she was better then Zane, she hated the ideals and the ways of Cyber Legacy as she have her own ideals of dueling philosophy. (She's there cause her father is the current heir) When she saw Zane and his infinite potential hidden talent along with his dueling style fits the ways Cyber Legacy perfectly, she ran away from school (and her home) to make her father choose and train Zane instead of her.
Then she showed herself again to her father years later when she attended Duelist Academy. And she aced that school and graduated within one and a half years instead of three. She was very successful with her Machine-themed deck in the Pro-League but she always felt it lacked something, even if she's always winning. (She became knowns as the successor of Bandit Keith as no one else have been this good with machine-themed deck before him until now. And then later on, Zane will fill the gap once she leaves Pro League.) For one thing, her philosophy in dueling is ultimately, "Enlightenment" through dueling (By winning of course) to achieve the "One Draw" to win in any situation. (Or "Heart of the Cards") She believes that this is the thing that the legendary duelist like Yuugi Mutoh and Seto Kaiba have that separates from common elite duelist. (She doesn't care about "respect" or "honor" in dueling. Nor does she care about just sticking with just "Cyber" part of the Machine-deck.) And she attempts to do this with Machines as she believes it's the best type of cards that fits her style. (Yuugi have done this with Spellcaster, and Kaiba have done this with Dragons, in her opinion)
Then one day, during her bored success of her winning streak, (And just one week before she had a scheduel to duel the champ of Pro League, "DD") she met Yuugi Mutoh by chance. She forced him on a duel (She gave him an extra duel disk cause Yuugi wasn't carring one) after a few minutes of talking/convincing. The result of the duel was an easy win of Yuugi after just a few turns. However, this loss was the exact thing she needed and realised that just sticking in Pro League isn't gunna help to achieve her "enlightenment" and thus the next day, she declared that she'll temporary resign and then no one have seen her since. (Until of course, she shows up in the anime show of my imagination)
It seems as she have a bit of a crush on Professor Chronos/Crowler, either that, or a very high level of admiration of him. Anyway, it is because of him that inspired her that card game isn't just about winning in duels, but also studing the cards and gaining knowledge during the days of her youth. (And thus she wants a Ph.D in dueling) Sheppard doesn't like the fact that his daughter likes him. (gets worried that he'll become his son-in-law)
She doesn't like the fact that Zane have lost his way and is on the wrong path of his dueling style. (However, she doesn't do much to help him. She believes it's just his new challenge of his life that he must overcome) When she appears, Zane immediately challenge her to a duel but she refuses, saying she'll duel him once he corrects is own path and "Jumps over the stepping stone he's stuggling against". She also have a keen interest of Jaden as he's the only young duelist that she ever met that have even more hidden potential then even Zane. (She does duel Jaden later on. And also one of the few duelist to beat Jaden.) She ends up hanging around in Duelist Academy for interest in Jaden and watching Zane from afar if he can ever return to normal. Because of this, Sheppard have assigned her as an apprentice/assistant teacher under Crowler. (Sheppard wanted to put her under someone else, but she insisted she'll be under Crowler, and even dueled her dad into submission to be this way) After this, more students sleep less, and attend classes of Crowler. (Cause the new assistant teacher is hot, and energetic/cool unlike Crowler)
Key/signature Card:
Cyber Searcher
Star 3 / Machine / Fire / 1000ATK / 600DEF
Effect: By Tributing this face-up card, select 1 Machine-Type monster from your Deck, show it to your opponent, and add it to your hand. Then shuffle your Deck.
(NOTE: This card have a "spirit" like Winged Kuriboh/Ojama/Gem Beast Ruby/etc. And she can see other spirits along with her own)
Other cards she have been known to have used
Cyber Dragon
Cyber Phoenix
Proto-Cyber Dragon
Chimeratech Overdragon
Cyber Twin Dragon
Cyber End Dragon
Gatling Dragon
Super Vehicroid Jumbo Drill
Cyber-Stein
Jinzo
Spell Canceller
Blowback Dragon
Barrel Dragon
Reflect Bounder
Dekoichi the Battlechanted Locomotive
Red Gadget
Green Gadget
Yellow Gadget
UFO Turtle
Victory Viper XX03
Ancient Gear Gadjiltron Chimera
Ancient Gear Gadjiltron Dragon
Gyroid
Drillroid
Submarineroid
Gear Golem the Moving Fortress
Heavy Mech Support Platform
Helping Robo for Combat
Kinetic Soldier
Perfect Machine King
Satellite Cannon
D.D. Scout Plane
Blast Sphere (JPN card. It's basically Adheasive Explosive effect, but with LP damage burn effect to boot)
Cannon Soldier
Card Trooper
Des Wombat
Sangan
Spirit Reaper
Magician of Faith
Breaker the Magical Warrior
Marauding Captain
Tsukuyomi
Power Bond
Limiter Removal
Metamorphosis
Future Fusion
Overload Fusion
Dimension Fusion
Machine Duplication
Heavy Storm
Smashing Ground
Shield Crush (JPN card)
Inferno Reckless Summon
Mystik Wok
Emergency Provisions
Graceful Charity
Pot of Greed
Premature Burial
Monster Reborn
Dark Hole
Mystical Space Typhoon
Snatch Steal
Last Will
Book of Moon
Card Destruction
Giant Trunade
Megamorph
Scapegoat
Swords of Revealing Light
Call of the Haunted
Solemn Judgment
Sakuretsu Armor
Mirror Force
Torrential Tribute
Bottomless Trap Hole
Ultimate Offering
Exchange of the Spirits
Waboku
Magic Cylinder
Draining Shield