I asked the following question: Are there any instances of an individual whose Animagus form is a magical creature?
It was closed as a duplicate of
Can an Animagus take the form of any animal?, likely due to @DVK's answer here, which included the following:
There was also never any mention of Animagus form being a magical animal. But it's unlikely you will obtain magical powers foreign to you even if you self-Transfigure yourself into the form of a Phoenix or Unicorn. - DVK
The premise of my question distinguishes between regular animals and magical animals -- I am not lumping them all together. Because @DVK has not found a reference to a magical animal that serves as an Animagus doesn't mean it doesn't exist. I note, and @DVK agreed with me, that the statement in question is not based in canon and is not referenced. Basically, it's an opinion, not an answer, and there is a distinction between a regular animal (giraffe, horse, stag) and a magical creature (Kappa, Augury, HORKLUMP!).
I truly think the two questions are distinctive enough that they are not duplicates. I would really like to have my question re-opened: Are there any instances of an indivdual whose Animagus form is a magical creature?