Raise Dead question

[Deuce]

So it seems my party has gotten themselves into a bit of a quandary. The halfling rogue was caught away from the party by a brain collector (neh-thalggu) & subsequently was held & unfortunately lost his brain, lol.
My question is this. If said party happened to stumble upon the fresh corpse of the halfling & then was able to kill the brain collector shortly after, would a raise dead spell work, if "a brain" was placed into the halfling from the now deceased brain collector? Or would it have to be the halflings brain for the spell to work? What about a "frankenstein-esque" halfling body but a new brain?
The brain collector has 12 brains presently so this could get a bit interesting. Also the raise dead spell is not very specific in its wording "While the spell closes mortal wounds and repairs lethal damage of most kinds, the body of the creature to be raised must be whole. Otherwise, missing parts are still missing when the creature is brought back to life." The body must be whole but it doesn't exactly state the original body, just saying...
Did I also state I love necromancers when I occasionally play? I also feel this may be appropriate since we are getting close to Halloween & the player is all about this, he loves the idea of a "alternate" new PC but same old body.

[Derek Dalton]

With the brain missing you need more powerful magic. With a brain shoved back in I don't see a problem. If you have Horror Adventures use some the of the options listed for him. I as a GM would allow him to change his character except race if he wanted in this case.

[Aelreth]

Before I say anything, Game Master digression is the first and last rule. What every they find funny, logical, amusing, etc, is what goes in the end.

I am unfamiliar with the neh-thaggu, so I can only fall back on comparisons (mind flayers, etc), but there have been plenty of brain eating monsters over the years. Usually the monster's special ability entry should say something along the lines of 'can only be raised back from the dead with X' spell, or 'requires a Miracle or Wish Spell' to fix what ever was done to the dead person.

But as for putting a DIFFERENT brain in, unless you were doing some kind of flesh golem experiment, this should just not work. You would need to use a regeneration/wish/miracle spell to first replace the missing brain, THEN raise dead. Hell you can not just sew a different arm on and call it a good day, let along a brain.