The third essential question determines the Main Character’s preferential approach to problem-solving.
By temperament, Main Characters (like each of us) have a preferential method of approaching Problems. Some would rather adapt their environment to themselves through action, others would rather adapt their environment to themselves through strength of character, charisma, and influence.
There is nothing intrinsically right or wrong with either Approach, yet it does affect how one will respond to Problems.
Choosing “Do-er” or “Be-er” does not prevent a Main Character from using either Approach, but merely defines the way they are likely to first Approach a Problem. The Main Character will only use the other method if their preferred method fails. Having a preference does not mean being less able in the other area.
Do-er and Be-er should not be confused with active and passive. If a Do-er is seen as active physically, a Be-er should be seen as active mentally. While the Do-er jumps in and tackles the problem by physical maneuverings, the Be-er jumps in and tackles the problem with mental deliberations.
The point is not which one is more motivated to hold his ground but how he tries to hold it.
A Do-er would build a business by the sweat of his brow.
A Be-er would build a business by attention to the needs of his clients.
Obviously both Approaches are important, but Main Characters, just like the real people they represent, will have a preference.
A martial artist might choose to avoid conflict first as a Be-er character, yet be quite capable of beating the tar out of an opponent if avoiding conflict proved impossible.
Similarly, a school teacher might stress exercises and homework as a Do-er character, yet open his heart to a student who needs moral support.
When creating your Main Character, you may want someone who acts first and asks questions later, or you may prefer someone who avoids conflict if possible, then lays waste the opponent if they won’t compromise.
A Do-er deals in competition, a Be-er in collaboration.
The Main Character’s effect on the story is both one of rearranging the dramatic potentials of the story, and also one of reordering the sequence of dramatic events.