If you truly wish to get more evil characters, create a tale where the "Love Biologicals" rule gets evolved out, or by a small bug or virus.
Or better yet, a virus infects some of the population that makes them feel the eed to kill biologicals so that the bilogicals can't kill eachother.
I already have had my evil character;
Nemesis. And he was the subject of a “twisted” Bace-Code.
His accomplishments include; helping the Necromicon, being directly responsible for the deaths of billions, being INdirectly responsible for the deaths of even more billions, the destruction of around twenty inhabited planets, Illegal genetic experiments on the species known as the “
Over-Deity of Fear”, enslavement of a alien species, theft of a Wexxian
Champion and the
Originator Station and jaywalking! He is also one of the reasons for the beginning of the
Galactic Age of Decent and he was the direct reason for the downfall of the Wexxians and their 200 year exile.
Not a nice guy!
Also the Neo-Wexxians in the Age of Decent; where without Base-Code, it did not mean that they where evil, but that they where without purpose in their lives and thereby lost in themselves.
Axon was also a very dark character before the Reclamation; where he was a Neo-Wexxian.
i can't imagine how many times that's been played 
True, when I created the Wexxians I was determined to avoid a “
Terminator” species… so I thought; “What’s the opposite?” and out came the Wexxians in all their hippieness!

Now its time for something more nice…
I percent to you all… the Model I have been working on ever since I got SketchUp… the remake of my favourite ship class; the Wexxian Champion:
Wexxian Champion:
Manufactured: The Licentia Station, Wexxian Space Docks.
Type: Battle Cruiser.
Standard Length:8.000 meters
Range:Near infinite range
Maximum Speed:In outer space: 1/15 of the speed of light
Hyperspace: 9.3 parsec an hour
Crew:One Captain and Navigation, Science, Communications, and Tactical officers along with Doctors, nurses and engineers: Altogether Crew: 2520
Capacity:20,000 troops, 2000 Fighters
Weapons:100 Ionic Disruptor Batteries, 25 Thoonling Batteries, 25 Standard Torpedo Tubes, 5 Tractor Beam Emplacements.
Defence:Gluon Particle Shield.
Nano-enhanced self repairing hull.
Power source: One Antimatter Reactor.
Engines:One Main: XXL class Tachyon Driver.
Two Secondary: XL class Tachyon Drivers
One Hyper-Warp Jump-Drive.
Description:The Champion was originally designed for the CAB as an assistance to the Alliance when the time again came where the forces of the galaxy would try to destroy the CAB. The Champion was made to accommodate all the races in the CAB alliance and was soon put to the test in the Necrid Discord. Where the entire navy was destroyed in the final battle of Abydos; where the Originator was destroyed.
With the Wexxian Reclamation, the Champion was re-instated in the Royal Navy, and given a good upgrade in the process, with some minor changes in the design.
The Champion is the fist of the Wexxians, as well as a home; the 8 km long battleship is also a nomadic city where a sizeable part of the Wexxian population resides. But city or no city, the Champion is a powerful and respected ship.
Status:Hundreds of champions served in the Necrid War, none survived the final battle. The Reborn Wexxian Armada had on its peak a fleet consisting of 526 Champions. Twelve survived the Union War:
New Beginning
Dawn Bringer
Protector of Rights
Memory of the Fallen
Sanctity of Life
Legend of the Reclaimer
Shield of the Innocents
Blessed Voyage
Welcomed Friend
Ghost of the Ancestors
Benevolent Touch
Lord of the InfiniteWithout the
Licentia, the Wexxians are not going to be building more Champions for the moment, as their economy already is stretched enough to keep their current fleet in shape.
The Champion was always my favourite, it was also the model that took me the most time making, and therefore is made with two different techniques as I became better at SketchUp while I was toiling with the model.
Today I finally finished the last details and I am ready to percent it to you all. It took months… but it was worth it!!!
Available for download here:
http://sketchup.google.com/3dwarehouse/details?mid=f385b1cd8307446fba8cb40d9f2f4804