Katarina The Sinister Blade - she's probably the easiest, Bloodstorm Blade is just perfect for her. Blood Wind Ricochet for Bouncing Blades. One of the Shadow teleport maneuvers for Shunpo, preferably the move or swift action one, or maybe the standard action with Shadow Pounce. Blade Storm plus Thunderous Throw is the ult, Death Lotus.
Annie The Dark Child - Summoner with a few Extra Spell feats for fire spells like Fireball for Disintegrate, Buring Hands for Incinerate and Fire Shield for Molten Shield. Obviously the eidolon is Tibbers.