Honestly, you can be whatever character you want to be. Whether your character is good or not depends on research, dedication and inner mechanics of character building.
Not saying we shouldn't portray ourselves; it's just that WE are the easiest 'go-to' character.
What if we aren't interesting enough to be portrayed as a character?
I will say that unless your persona is INTERESTING (not likeable, you can have a not-likable persona and still be interesting. I.E. Tommy Cooper and Amazing Jonathan), you will not get the reactions you want.
Audience involvement gets better reactions every time. But I think you need more involvement than 'pick a card, think of a number, etc.' In this case, you need heavy scripting and analysis to 'isolate' the situation so that the spectator is only going to go in the direction you want them to go. From there, you can routine it further to build suspense and reactions where you want it to.
You are the tour guide.
The 'holier than thou' attitude is a whole different ballgame that goes beyond character building.