I could do without "Nanoblack sustain me," as it tends to be a little long for its purpose, and the UC2 version of "My blood is black" is a lot more interesting.
Jester's still my favorite, though, like the evolution of the Fem1 voicepack from UT1.
If they bring back Xan as an interesting character again (ie: ditch the capture/reprogrammed story from 2k4) and keep going with the Ghost in the Shell stuff they've got going, where we're not sure if/to what extent he's still human, he could be fun.
I'd almost like to see him in an Alpha 152 / Magician type role, though the rampaging super-creation is probably too played-out.
I'm caught between wanting to do something more interesting with him, and wondering if the simple bad-assedness of, "I'm here to mop the floor with everything, so run, human!" is enough, and anything more complex would ruin what makes him cool, like giving Duke Nukem a moralistic side-plot.
Where it was stated that Xan was a 100% robotic being?
Heavily implied in 2k4 when he led the robot revolution, was captured and reprogrammed. But, then, in UT it's never clear that the robots are 100% artificial, aside from the few that get such status specified.