Mobile Suit Gundam Wing is my favourite among all the Gundam series. It's definitely mecha with characters so young and yet so strong. I love all 5 of the Gundam pilots but I certainly am more drawn to Heero's character. Not a fan of Relena as I think she is annoying and gets in the way more often than add to the story.
Gundam Wing. Ok, now don't judge me, but I was totally obsessed with this show when I was a middle schooler. My favourite was the blonde! :) But the other characters were intriguing as well--a great series overall.