Zero44, I have a few questions for you:
* What games do you play other than D&D? Does he behave the same way during those games?
* It sounds like (from the info you've provided) that this player doesn't like D&D--does he happen to really like/prefer other games (say, GURPS, World of Darkness, etc.)?
If he's just as disruptive in other (non-D&D) games that I'd say that he truly is a problem player, & a gaming group intervention definitely is in order.
However, if he only acts disruptive during the D&D games, then it sounds more like a player who dislikes the game, & is acting out as a way to show his disapproval. He's still a problem player, but the nature of the problem is different, overall: basically, if he's playing something that he dislikes, he winds up trying to ruin the experience for everyone, and possibly trying (in his own way) to diussuade the group from playing D&D in order for them to play a game that he likes/prefers instead.
Also, trying to find an in-game remedy to his behavior problems may just backfire: if he creates his PC first, & the other players build characters to accomdate him, he may just as likely just have the character change alignment & resume his disruptive ways. Or, he may cry out that, once again, he's being "unfairly singled out," and cause him to keep acting the way he does (if not worse).
Zero44, this guy may be a friend, but don't let his quirks/behavior ruin your games. Believe me, any problems in a freindship are just magnified at the gaming table.
If he's acts up like this at the gamign table, despite what game is currently being played, then I'd really suggest that you & your group sit down & talk with him about it. Let him know what your issues are, and provide a few possible solutions. If he says that he'll try to amend his ways, and then immediately resumes his disruptive behavior, then, once again, confront him as a group, discuss what happened in regards to what was discussed earlier (i.e., acting disruptive after he said he would no longer act disruptive), and, as a group, inform him that he is no longer welcome to the gaming table, and will no longer be invited to the gaming table. Let him know that this decision only applies to gaming, and reaffirm that he is still considered a friend & welcome to any non-gaming activities.
If he only acts up during D&D games, & has a problem w/ D&D, then amend the above solution. If he remains a problem during D&D games, then state that he's no longer welcome to the D&D games, though he's still invited to any non-D&D games the group plays. However, it's important to let him know ahead of time if your group intends to play D&D, and if it looks like you'll be exclusively playing D&D for a while (which would mean he'll be left out for weeks/months at a time).
It may help if, at all possible, you relocate the gaming group while he's not in it--could just be at another location, or it could be at a place which may not be convenient for him to go to. Just a small way to show that from here on out, things will be different.
It is extremely important to be unaminous as a group when it comes to this. Sides/factions can be quickly formed in the group, & can ultimately break the group apart. My group used to be a quite large group of friends, but personal issues broke it apart, & continue to break it apart--it doesn't look like a gaming group at all, anymore (much less a group of friends) due to friendship politics.
I understand that you are all friends, & that you probably don't want to hurt the guy's feelings. However, it's just as important that he acknowledge & respect the feelings of other group members, & vice-versa.
Good luck, man. I hope this turns out OK for ya.