He mostly knows about the combative abilities of the individual party members. He of knows little to nothing about Mr. Star or Ansel, other then to avoid The later's reach, and the former uses machines for his dirty work. However, he does know about Aach-Ti's history. Especially the part about how he wants to redeem his race. As far as Kallad goes, the Reaper knows about Molehk, but no more than Aach-Ti knows. He was told that the spirit can allow him to do super natural things, but they aren't sure what exactly, seeing as how he never, or rarely uses those abilities, IF he can. The Reaper knows that Shadow is supposed to be the powerful of the Reapers, excluding Grim himself, even if Shadow doesn't realize his full potential. Personally, this Reaper believes he sucks. The information the Reaper knows about Mrs. Blake is almost all combative, which Aach-Ti knows of for the most part. You've never seen her push her limits, or go anywhere near them. The Reaper on the other hand, knows that she is capable of Godly Powers. To the Reaper this made sense considering she is was a human and made a God. The Reaper knows more about Sek than the others and sees the boy as a priority one target. So long as he doesn't upset Sek by making him reach extreme emotional levels, he shouldn't be a huge issue to kill. Because of the way he was raised, he sees the boy as naive. Dispte his childishness, he was Told that Sek was the most dangerous, even if the boy doesn't know that yet.