Can a person be included in a Lookup Column or Can a variable be set to a person?

I have 2 lists: 

1. RequestTypes has 2 columns -  Type (string) and Task Type Builder (person).
2. Requests - I have a column that is a Lookup to the RequestTypes list.  

In the lookup, under "Add a column to show  each of these additional fields:" the Type Builder field does not show up.  Is this because the field is a person?

I also tried to set a Variable to this field, but it does not seem to find it.  The variable is vTaskTypeBuilder is type "Person or Group".  Here is what my "Set a Variable" configure looks like:

Do you know if a variable can be set to a person in a list?  Or why does a person not show up as a column to show after a lookup?