Xbox – Is it possible to move a destiny character from one profile to another

Taken from the official support website:

Profile improvements and changes

Latest console software picture The latest console software includes the following profile improvements and changes:

You can download your Xbox Live profile to multiple consoles. However, you can only sign in to one profile at a time. Your profile is automatically updated on your console and Xbox Live, whenever you sign in or out of your profile. To help keep your account safe, you can choose to require or not require your Microsoft account password on any console, For more information, see Password-protect your Xbox Live profile. If the last time you signed in to your profile you were using a different console, you’ll see a notification of this when you sign in. For more information, see Your gamertag was last signed in on another console. It takes significantly less time to download your profile (called "recover" in previous versions of the console software). https://support.xbox.com/en-US/my-account/manage-gamertag-and-profile/profile-storage-changes

Since this is a three year old post, with enough time the problem fixed itself and now have it saved on every console just only signed in at one time.

Instead of 'demoting' the account to a child account, consider setting up the parental controls yourself in the Family Settings tab. This allows you direct control over the settings to pick and choose a level of security you need. The link below shows some of the power of parental controls.

Xbox 360 family settings

Hope this helps!