Consider people involved with pinball with signatures, personal portraits of any sort (real or character), easter eggs, and cows for your answer included on pinball machines.
This is the "physical" representation on pinball machines, meaning visual, not audio or other conditions, as per description in the OP definition.
The answer is not a game designer, and requires a bit of research.
None of of the listed people shown are the answer.
Very narrow window considering actors and titles from the 1990s and up.
Think backwards in pinball history.
o-din was on a better train of thought.
I would prefer not to make a mistake, but I can think of one person off my head that is nearly 50 pinball games alone. He is also prominently and unmistakably displayed on several games, not "hidden" in any way, if a person know what he looks like in "real life". He has also been involved in pinball since the 1970s.
If the OP wants "portraits only" that is a different answer.
If the OP wants "actors only" that is yet another answer.
If the OP wants "voice" that is still another answer, but LESS than the physical answer, and it is not Steve Ritchie.