We don't currently have a way to do that. Users are typically created via the site registration process, so users created manually are treated no differently. Users only have permissions based on their roles there is no such thing as a admin or power user other than defined by their roles and the permissions of those roles. Only Admins and role manager role can manage the roles of other users and even role manager cannot remove a user from the admins role, only admins can do that.
Best,
Joe