Graff, charactoerization

At the begging of th chapter Graff is talking about Ender with another officer. As you can see he is showing a sense of compassion towards ender.

Graff



  "I've watched through his eyes, I've listened through his ears, and tell you he's the one. 
Or at least as close as we're going to get." 
  "That's what you said about the brother." 
  "The brother tested out impossible. For other reasons. Nothing to do with his ability." 
  "Same with the sister. And there are doubts about him. He's too malleable. Too willing 
to submerge himself in someone else's will." 
  "Not if the other person is his enemy." 
  "So what do we do? Surround him with enemies all the time?" 
  "If we have to." 
  "I thought you said you liked this kid." 
  "If the buggers get him, they'll make me look like his favorite uncle." 
  "All right. We're saving the world, after all. Take him." 


 You do not learn much about Graff though until the end of chapter 3.
In chapter 2 Graff is again being simperthatic to Ender


"All right, it's off. How's he doing?"   "You live inside somebody's body for a few years, you get used to it. I look at his face
now, I can't tell what's going on. I'm not used to seeing his facial expressions. I'm used to
feeling them."
 
  "Come on, we're not talking about psychoanalysis here. We're soldiers, not witch
doctors. You just saw him beat the guts out of the leader of a gang."
  "He was thorough. He didn't just beat him, he beat him deep. Like Mazer Rackham at
the--"
  "Spare me. So in the judgment of the committee, he passes.
  "Mostly. Let's see what he does with his brother, now that the monitor's off."
  "His brother. Aren't you afraid of what his brother will do to him?"
  "You were the one who told me that this wasn't a no-risk business."
  "I went back through some of the tapes. I can't help it. I like the kid. I think were going
to screw him up."
  "Of course we are. It's our job. We're the wicked witch. We promise gingerbread, but
we eat the little bastards alive."