You're interested in more than a partner who thinks analytically - they have to be reasonably optimistic, as well. So comments about optimistic philosophies might work; Leibniz, maybe. "Progressive" ideologies are generally fairly optimistic, so politically, you'd want to talk about, say, John Dewey, Ralph Nader, Lester Ward, etc. Nietschze is a mixed bag; his early stuff is quite pessimistic, but his latter works are much more optimistic.

Alternatively, you can find correlations. My experience suggests you might find exactly what you're looking for in Swing dancing partners.