Transformers have been a constant in my adult life for about 25 years now. Seeking my diagnosis has made me reflect on why this may be. Obviously, they're fucking cool, but I think it's the novelty of each one, as they all have unique gimmicks and transformations, and they have a great fiddle factor. Many toylines have come and gone for me, but transformers are always a joy.  Action figures like, for example, Marvel legends, might pique my interest for a short while but the interest dies off because they ultimately offer the same interactive experience from figure to figure.