Hello,
thanks for reaching out to us with your question. You are right, we don't have a specific rule against impersonating other users on TibiaQA. Other than content guidelines, we don't really run any terms of use, or rules for TibiaQA. Instead, we have a simple Code of Conduct that is supposed to steer members of our community in the direction we would like to see on this site.
Creating user accounts with names that are meant to confuse or mislead other members of this community would not be acceptable. So far, we didn't have any similar attempts. If it turns out such attempts are made, we should update our Code of Conduct to call that out as unacceptable behavior.
Best regards,
Sebastian