Deleting a user won't permanently destroy any of that user's data (profile, chat history, etc) regardless of whether they were an admin or not. They will still show up in the user list under the admin section of the website and may be undeleted as necessary.
If you need a user fully removed from the system, you can contact support via our help desk: https://support.atlassian.com/servicedesk/customer/portal/32
...from the beginning. We have built up a lot of content in HipChat, with it being a core tool in our distributed company model. While it is true that we didn’t need to move to Slack immediately, we felt it...
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