Okay! I'll throw mine up here, and then we can maybe get the ball rolling!
Name: Muramasa-no-Moritsune (Note: Follows the old Japanese style of naming, so Moritsune is his first name)
Age: 22
Gender: Male
Species: Human/Dragon Rider
Height: 6'1"
Build: Slender, but well-muscled
Personality/Traits: Moritsune is a calm, focused warrior, unflappable in even the worst of situations during a battle. Outside of battle, though, he is somewhat withdrawn and taciturn, often withdrawing from contact with others as a result of poor interpersonal skills. Despite having lived his life as a weapon used by others, he seeks to someday find companionship with others.
Magical Aptitude (Note any specialties): Precise mastery of telekinetic magic, able to perform it with no visible strain and with no need for an incantation. Otherwise unremarkable, save for the ability to create and wield magic-forged replicas of weapons.
Weapons:
Wyrda eld Jierda (Fate Breaker)- Moritsune's Rider sword, resembling a long katana blade mounted onto a European rapier hilt. As all Rider swords, unbreakable and always sharp. Unlike many, however, when the sword is sheathed and its name spoken, it enables Moritsune to unleash a variety of magical attacks.
Eld Moi (Changer)- An odd weapon of Moritsune's, it normally takes the form of a relatively plain, unadorned staff set with a bright red ruby atop it. However, when its name is said, followed by the word for 'sword', it shifts into a ruby-pommeled, guardless straight sword. When its name is spoken, followed by the word for branch, it returns to its staff form.
Kveykva Reona (Lightning Reaper)- A long, lance-like greatsword. Unremarkable, save for that it bears properties similar to the Rider's swords, and also weighs far less than it's size would indicate...
Fighting Style(s): Moritsune is an experienced warrior, trained since childhood in a variety of fighting styles, a fact that is made all too clear when he is seen fighting. His most familiar and comfortable style is a derivative of Iaijutsu, relying on rapid drawing and sheathing of his sword to cut through enemies. He rarely uses the weapon to block any form of attack, instead either using the scabbard or, more commonly, simply evades the attack thanks to his extensive training in Ninjutsu. When he draws his greatsword, however, his entire combat style changes, and he instead fights with a relentless offensive style, often using the force of his entire body to generate massively powerful strikes.
Flaws/Weaknesses: Damage sustained during training a long time ago left Moritsune with a severely weakened left arm, which he compensates for via a magically-imbued gauntlet from his homeland.
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Mount Name: Dynames
Age (Approximate): 19
Gender: Female
Species: Dragon
Size (Large/Middle/Etc): Middle, roughly the same as Saphira or any female Dragon
Build: Slender, wiry, with pronounced wings. Possesses a second sub pair the lay flat against the larger wings until she is in flight. Long, crystal-esque spikes on tip of her tail and running along the sides of it halfway.
Personality/Traits: Dynames is flighty, self-assured, and flirtatious to a fault. Unlike Eragon and Saphira who bonded early, she came to Moritsune as a young adult, and as such has a great deal more autonomy than most bound dragons.
Abilities of Note: Dynames is an incredible flyer, easily able to outmanuver near any foe in the air. Her breath weapon, instead of fire, shoots out what seems to be a storm of minuscule crystalline shards, causing colossal damage to organic and unarmored foes.