(In response to this post.)
The same is the case for me regarding Mark’s alter egos.
Darkiplier seems tall, with broad shoulders, and an imposing yet trim form to go with his domineering and tightly controlled personality. With a pallid, almost deathly complexion that compliments his cold demeanour.
Google seems angular and slight, with narrow shoulders and hips, and a small (almost childlike) form that doesn’t take up much space. Because it would be inefficient for an android to require more room than necessary.
Wilford seems large and soft, with a bit of a belly, like a human teddy bear. Not large enough to be rotund, but rather stocky. It’s a physique that compliments his jovial personality.
FNAF!Mark is the classic “big guy” warrior archetype, all muscle and a physical strength that could do a lot of damage if he’s not careful. Which goes with his propensity for violence and skill with various forms of weaponry. Even his voice is noticeably deeper than Mark’s other characters.
Well, except for Darkiplier’s, because Dark’s a demonic abomination with a freaky-ass multi-tonal voice, which thunders like the voice of Zeus echoing down to us from the summit of Mount Olympus.
ALL THESE CHARACTERS ARE PLAYED BY THE SAME MAN. And yet they leave wildly different impressions in my mind, even down to the shapes and sizes of their bodies. That requires more than just the right clothing and makeup; it necessitates real skill on the part of an actor, to change the way they carry themselves into a manner that fits the character. (And I’m familiar with the methods and work ethic involved, as I took acting courses during my teenage years to overcome my innate shyness.)
MARK AND JACK ARE HUGELY TALENTED ACTORS. Don’t believe anyone who says any differently.