I really love Gundam Wing. I've seen alot of Gundam series, and Wing is by far my favorite. It has a very deep and meaningful storyline and there is symbolism everywhere.
As it was pointed out, most of the main characters are named after a number. Heero means 1, Duo means 2, Trowa means 3, Quatre means 4, and Wufei means 5 in some language.