You can delete your account, including all generated content and uploaded photos, from inside the Foxy app.
Steps
Open your Profile menu (top-right avatar).
Tap your email address at the top of the menu.
On the My account page, scroll down to Delete account.
Confirm the deletion.
This permanently removes your account, all your characters, all generated content, and your uploaded training photos. Unused credits are forfeited.
If you have specific data-deletion requests beyond a full account deletion (for example, you'd like to delete a single character but keep the rest of your account), open chat with us via the Profile menu → Support and we'll help.