#5 - Sept. 18, 2010, 8:29 p.m.
Hi Protoman,
As flatspriest mentioned, your friend is more than welcome to use a RAF invitation on his current battle.net. It will essentially be a brand new Warcraft account. He will also be able to transfer as long as both accounts meet the requirements.
Paid Character Transfer Restrictions for Battle.net Accounts
http://us.blizzard.com/support/article/26163
Let us know if you have any additional questions.