Originally Thomas & Lady, but Mocha has forever ruined that ship because of her reason for Diesel 10 wanting Lady Also, the more I thought about it, the more I realized that Thomas had the greatest chemistry with Emily because

A: She was in the show with Thomas
B: They both worry about one another
C: Emily missed Thomas's company in the movie that must not be named...............

So, if you ship these two, come join and enjoy!!