Vincent Valentine:

The son of Grimoire Valentine, a Shin-Ra scientist, Vincent grew up to become a member of "The Turks"(A shady organization within Shin-Ra known for activities such as espionage, assasination, kidnapping, and various others). After he was assigned to oversee the Jenova Project stationed at Nibelheim, he fell in love with one of the scientists working there, a woman by the name of Lucria Crescent, the assistant to Professor Gast. But Lucrecia rejected Vincent out of guilt born years earlier when Grimoire died while saving her life. Instead a relationship was eventually formed between her and her colegue Hojo. Eventually she became pregnant, and deemed to be used as a test subject for the Jenova Project.
Vincent was killed and later brought back to life by Hojo and his experiments. The endowed Vincent with a number of supernatural abilities such as immortality and super-human reflexes/strength/speed. He is a master with fire arms and will probably never miss a target he is aiming at.
Display of Power:
While in Chaos form, Vincent charged head long into Omega, a planet killing beast, effectivly nuking the atmosphere. Vincent's fate after this cataclysmic explosion is unkown.
Yoruichi Shihouin:

Yoruichi Shihouin is an attractive, dark-skinned woman who can transform into a black cat for long periods of time. She is intelligent and witty, and is intimately knowledgeable of Soul Society and its workings, as she was the former leader of the special forces. Although of noble birth, she acts differently from other nobles.
Yoruichi is also highly skilled in the use of flash steps, a high speed movement ability. Though this is by no means a unique skill, as most seated officers are capable of performing it to various degrees, Yoruichi holds the title Goddess of Flash because she has mastered this ability to such an extent that she can appear to be in several places at once and wipe out entire special forces squadrons in moments. The full extent of her abilities remain unclear, but she was able to outrun Byakuya Kuchiki while carrying an unconscious Ichigo over her shoulder. She was able to perform around 300 steps before feeling out of breath. Furthermore, she states that she is out of practice after doing so, insinuating that she'd once been even faster and probably will renew and surpass her former speed if she were to renew her training and combat practice.
Yoruichi is also skilled with flash cry, a technique that combines hand-to-hand combat and kidō. It concentrates high-pressure kidō energy around the body, allowing it to be fired at opponents. It can also be used to instantly neutralize an opponent's movement. Her flash cry abilities are strong enough to hurt or severly damage Ichigo. (Taken word for word from Wikipedia because I am a lazy a**.)
Display of Power:
Yoruichi's Flash Cry completely stops Soi Fon's movment, which created a massive crater behind Yoruichi due to the energy being released there.
So anyway, have at you!