This going to be a "what if" fic. A thousand years ago, Shabrinigdo wasn't defeated, and he gained possesion of the Sword of Light. Keep in mind the human race has been ruled by the Mazuko race for about a thousand years. Here is a list of characters, and the rather dramatic changes to their personalites.
Note: I don't plan on reading over this, so read at your own risk
Zelgadis Greywers - 1/2 human, 1/2 Mazuko. (his mother was raped by a Mazuko) He was never turned into a Chimera, and because of that, he has changed dramatically. Zel is a flirt who charms all the ladies, a fact that drive Lina up the wall grin But behind his cool guy exterior, he is really a sensitive person who cares deeply for the Slayers, the resistance both he and Lina have built with sweat, blood, and tears.
Lina Inverse - She is not very sure of herself because she failed to save her "neechan" with her magic when she was young. Lina is very quiet but she has a temper that is slow to burn and even slower to cool. The Dragon Slave is her strongest spell, and she has no idea how to cast the Giga Slave.
Amelia Wil Tessla Seirunne - Grim ruthless warrior queen of the city state Seirunne which is feared throught the world for its soldiers.
Slyphial Raas Nada - Slyphial is the raucous barmaid in the inn town where the Slayers is mainly camped at. She has a huge crush on Gourry, and goes out of her way to get his attention
Gourry Gabriev - Decendant of the man who lost to Shaby. He is rather shy and spends most of his time with his books. But he is an excellant swordsman, even without the Sword of Light. Still not the brightest star in the sky.
Firia 'U Copt - Firia is truly a sad story. Being one of the last, if not last Gold Dragon, she was 'given' to Valgarv as a prize. But her acid tongue keeps Val form really mistreating her. Yet despite her acid-like tongue and tough exterior, Firia trully does consider Val her friend, not just her 'master' She hates Xellos with a passion.
Rezo Akoushi - The warrior Priest that raised Zel after his mother died in childbirth. Rezo is a quiet man, but is grim and almost bitter. He is somewhat cynical, but lets face it, he's had a crappy life. He lost the woman he loved to a Mazuko who turned her into a toy. Then he lost his daughter in pretty much the same way. The mention of Mazuko sends his hand to his sword, and he tenses for battle. Rezo is followed around ceaselessly by his apprentice/assitant Eris.
Shabrinigdo aka Shaby - He possesed the body of Lei Magnus. Lei and Zellas where deeply in love, and even after he has been consumed by Shaby, Lie's affection and longing for Zellas is shown, but not in a very nice way. Because of Shaby's influence, Lei keeps Zellas at his side as he plaything, and general slave.
Zellas Metallium - She loved Lei Magnus and when he was taken over by Shabby, she kind of went a little insane. Of course being used as a slave by your former lover doesn't help much! Zellas, I trully pity. She has withdrawn into herself so much I am not sure if she can even comprehend the world outside of her "shell"
Xellos Metallium - He has become completely cruel bloodthirsty and all around a real nasty guy. He leads all the Mazuko as their genral and has been awarded the Sword of Light by his bravery. Xellos takes cruelty and ruthlessness to new levals. Sheena, Dynast's general, is not so secretly in love with him, but he doesn't even pay attention to her. Xellos does, however, want Lina. He wants to extinguish the flame of her spirit. He wants to break her, and that kind of blinds him to others. So because of this, he has set out to single handedly destroy the Slayers as he did to the Gold Dragons so many centeries ago
Valgarv - He is almost fanatically loyal to Garv, and is just as ruthless as Xellos. But he lacks Xellos' blood-lust. He doen't revel in pain and suffering like Xellos, and because of this he hates Xellos as much as he servant/slave Firia. Despite all this, inside, Val is an emotional and mental wreck. All he thinks that he can fell is hatred and therefore he tries to feel only that. However as he gets to know Firia better, he realizes that what he and the Mazuko are doing is wrong. He begains to question Garv, and that leads to his downfall.
Chaos Dragon Garv - Garv is the leader of the aerial warriors in the Mazuko army. Garv is a MAzuko but he has honor (***) and is constantly teased by the other Dark Lords. Because of this, he is somewhat of a loner, and a rebel. He trully cares for Val who is like an adopted son to him.
That is all I have, tell me who I missed.
*** Note I know absolutely nothing about the other Dark Lords and am making this up. I have now idea whether or not Garv is like this, and I am not even going to attemp to draw Dynast, Dalphine, and Phizal.... what's his name.... So don't jump down my throat, just because I haven't seen NEXT and TRY. Sheesh, you people. And now I haven't read over this so Sheira becomes extremly mature and blows a raspberry at all those editors out there