CANON UPDATE TIME!
So, I finally got around to canon updating Kanda. He's up to date with chapter 200 (or, technically, post-200) for the moment, however since the
update happened through a dream, his physical state remains more or less intact (at least as intact as it's been... I believe I originally took him from 196? So no crumbly bits, at least.)
Basically, he will now know that he has, in fact, found the person whom he had been looking for all his short current life. And that person was his girlfriend in previous life yet his bro in the childhood of the current, so it is all really messed up, but in the end it's good. I think. Unless you start mocking him about his dead girlfriend having a penis because then you might die regardless if it being true.
It will probably take him from a few days to a week to actually deal with it. He will likely stay cooped up in his room during that time, attempting that heavenly action called thinking, unless Lenalee kicks him out and makes him eat dinner properly or something. Afterwards, he might not show so much of a change, however having such a weight gone from his shoulders and actually being free first time in his life, he'll likely be less restricting/intolerant both on himself and others. Including a wider variety of facial expressions, though even so the smiles don't happen all that often. And, of course, following that, less twitchy tantrums shall be thrown, though it might happen if you push him really far. All the oblivious, petty and violent is staying for the most part, however, save for the cases where he simply will not care. In which case he won't even beat up the kids! Certain Mr. Nice Guy, yeah.
Hmm, I think that's about it. So. Have fun~ :'D