So long as he isn't logging into your account, he shouldn't have access to your characters. Just don't tell him your account name.
If you need to change your account name, you could do this:
UPDATE accounts SET name='newname' WHERE name='oldname';
Replace newname with the new account name and oldname with the old account name. I've never personall y tried doing this, but I assume it should work. Could be wrong, though, I suppose :(.
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