It looks like you may have posted in the wrong place; this section is for feature requests. For support you'll want to click "Submit a request" in the top right of this page, and make sure you choose "D&D Beyond Assistance".
You'll want to try and give more information though; put the name of the missing character in the request, maybe mention if it was part of any campaigns (the D&D Beyond feature, that is) and so-on, as it will make it easier for staff to help you.
In general characters shouldn't simply go missing, however, if you have a character in a campaign and click "Unassign" instead of "Leave" then you can end up stranding the character inside a campaign that you can no longer see. Hopefully the support staff have a way to solve that if it's what happened!
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