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: 9-C, higher with sword | 10-A, 9-C with sword
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: Street level, higher with sword (One of the best fighters of the Seven Kingdoms; took down many men by himself on a battlefield just to reach Robb Stark. Even while somewhat atrophied and malnourished, and while his hands were bound, he kept up with a held-back Brienne of Tarth) | Athlete level, Street level with sword (able to somewhat keep up with a casual Bronn)
Speed: At least Athletic Human, possibly Peak Human (Most average men could barely keep up with his attacks) | At most Athletic Human (Considerably slower and more sloppy than before)
Lifting Strength: Athletic Human | Above Average Human
Striking Strength: Street Class | Athlete Class
Durability: Street level | Athlete level. His metal hand is Street level (stopped a sword strike)
Range: Extended melee range
Standard Equipment: Sword, Kingsguard or Lannister armor | Oathkeeper (A Valyrian steel longsword; As such, it is lighter, but also much sharper and stronger), his golden hand (After he lost his hand, of course), Kingsguard of Lannister armor
Intelligence: One of the greatest fighters in the Seven Kingdoms, above average when it comes to other situations. Would have received an education as a major 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.
Key: Prior to losing hand | After losing hand