Ser Jaime Lannister is a knight of the Kingsguard, the son of Tywin Lannister, twin brother of Queen Cersei Lannister, and older brother of Tyrion Lannister. Previously he served in the Kingsguard of Aerys II Targaryen and, infamously, he betrayed and killed Aerys during the Sack of King's Landing, earning him the sobriquet "The Kingslayer".
Powers and Stats
Tier: 10-A, 10-B after losing his right hand
Name: Jaime Lannister, The Kingslayer
Origin: A Song of Ice and Fire
Classification: Human, Kingsguard
Powers & Abilities: Skilled swordsman, Experienced fighter, well trained and considered naturally talented at combat.
Attack Potency: Athlete level (One of the best fighters of the Seven Kingdoms; Took down many men by himself on a war just to reach Robb Stark), Human level after losing his right hand
Speed: Athletic Human (Most average men could barely keep up with his attacks)
Lifting Strength: Athletic Human
Striking Strength: Athlete Class, higher with his sword
Durability: Athlete level
Range: Extended melee range
Standard Equipment: Oathkeeper (A Valyrian steel longsword; As such, it is heavier and thicker, but much sharper and durable), his golden hand (After he lost his hand, of course)
Intelligence: One of the greatest fighters in the Seven Kingdoms, average when it comes to other situations. Would have received an education as a Westerosi noble.
Weaknesses: Overconfident to a fault, which led to him being captured at Whispering Woods. After losing his right hand, he is nowhere near as capable a swordsman with his left hand.