I have a Bard of Heart oc that destroys their own personality in order to be more like their guardian who is an Heir of Heart. The Heir of Heart expresses themselves through collecting rare artifacts and trinkets and displaying them across the house, but in a misguided attempt to copy them the Bard of Heart just ends up becoming a hoarder, not really having a rhyme or reason for anything they collect, but always losing the stuff they need.

That sounds like a good match- The Bard of Heart becomes obsessed with someone else’s Heart. The Heir inadvertantly Changes the Bard’s Heart. Destructive tendencies by being a copy-cat.