I went back to World of Warcraft for a little bit (fully regretting that decision) and I was reminded of the account-wide mounts and this is the UI they use when you check under the "Collections" tab and you can see all of the minions/mounts you've collected on one character on the account you play.
Now let's say someone is not really happy at their main's progression or just wants to start over with the character completely (I.E. they like the character but they don't remember story or class mechanics) but they really don't want to lose mounts or minions they worked hard to get (I.E. Nightmare) something like this UI or something similar would be an interesting way of solving that. Instead of having the mounts be mailed, have the mount/minion section be something like this! I don't know if others have made topics like this. I just thought I would throw my 2 cents in!
Keep up the amazing story and game I love so much!