Here's the rundown of the first you meet:
Pathfinder Kaedras
Race: Eldar
Disposition: Selfish
Type: Ranger/Pathfinder
Class: Sniper/Infiltrator
Abilities: Infiltration, Long Range, Fleet
SpiritSeer Laenehl
Race: Eldar
Disposition: Good
Type: Warlock/Seer
Class: Black Mage
Abilities: Psychic Powers - Destructive and Morale, Close Combat, Ghost Walker buffs
Chud Fatz
Race: Ogryn
Disposition: Neutral
Type: Grenadier
Class: Chemist
Abilities: Grenade Launcher, Custom effect with grenades, Never breaks
Notice that I have included a 'class' description in each profile. Just as every player has a certain race they are more suited to, just so each of these characters would be more suited. As you're basically 'stuck' with Eldar, my aim is to make their style much more adaptable by introducing characters that are very different from each other.
The Ogryn may seem a surprise to some and some might shout 'FLUFF' but trust me, the story fits. Chud is as close to an 'intellectual' subhuman (but still nowhere near human intelligence) as you can get. A former Bullgryn, the poor soul has been pumped with so many chemicals and genetically modified to at least know which direction to aim his grenade launcher at. Although he doesn't understand exactly what his grenades do, he sees Farseer Celanae as his saviour and is willing to blindly follow orders and tactics to help her in her cause.
And it just gives me a huge excuse to give a Horrorfex grenade AND and Biotox bomb effect grenade to his grenade launcher ;).