If I'm not mistaken, you can disable your account here:
http://www.imvu.com/catalog/web_delete_account.phpUpon completing you will receive email with a restore link that is valid ONLY for full
48 hours (unless changed recently, was like that several months ago). after two days only way to reactivate the account is to send a form through help center and simply request to have the account reactivated, usually takes up to 6-7 days max and you can request it at any given time, IMVU never really deletes any of the disabled accounts as far as I'm aware, use the same password you did to disable once the account reactivated or simply use "forgot my password".
Cheers