THE PALACE OF HEROES

Kliff Undersn (Guilty Gear): The hero in the war against Gears, Kliff Undersn, may be old but he is still the most powerful man out there. Nameten jyane! REFLEX ROAR!
Potemkin (Guilty Gear): Honorable soldier of Zepp whose might and sheer will are unstoppable. POTEMKIN BUSTA!!!
Chipp Zanuff (Guilty Gear): Lightning fast ninja crusader. His bag of tricks allows him to turn invisible, teleport around, and go for the kill with a variety of quick attacks. Suprise?
Chipp Zanuff Army (GGX2): An ARMY of Chipp Zanuffs!!! THEY'RE UNSTOPPABLE!!!
Gill (Street Fighter: Third Strike): The Savior of Mankind. A combination of devastating power and reach Gill can finish his opponents from one mistake. BOW BEFORE YOUR MASTER!!!
Hugo (Street Fighter: Third Strike): The Iron-Blooded Giant. Smashes his opponents to oblivion with Palm Bombers, Moonsault Presses, and Gigas Busters. I'M NUMBER ONE!
Ryuji Hirasaka (Karte / Night Shift Nurses): A great and skilled doctor, this man can defeat all who stand in his way!!! OMAE NO ATAMA NO NAKAMI TO WA DEKI GA CHIGAUNDAYO!
Kisaku Ito (Kisaku): Heir to the Ito Lineage and suave gentleman whose technical prowess and martial art skills are devastating! GETTCHU!

Chairman Nogawa (Immoral Sisters): Cunning and manupulative business man - also happens to be Light's father!
Ryou Udagawa (Bleach): Brilliant Bounto who wields the devastating snake whip Fried! NO COMMENTO
Kitsunebi (Ninja Scroll): Moth-wielding super ninja whose flame engulfs those who oppose him! YUKEI!! YUKUNODA!!!
Yacopu (Galaxy Fight): Little bunny creature who kicks ass and takes names! Orewa saiko daro?

Images copyright their respective owners.
Guilty Gear sprites from Zazz's page.
Street Fighter III: Third Strike Sprites from Joram's page.
Other Guilty Gear images from various combo movies.