1. He's sooo hot.
2. I tend to go for three things in a guy: Tall, dark, and handsome.
3. I like his quiet personality, because I'm real quiet too.
4. He's got the BEST Gundam.
5. He's not annoying like Quatre or Wufei.
6. He's so mysterious.

Now let's check out the OTHERS:

Heero: He's a psycho, always trying to find a way out of everything by 
death. He NEVER shows emotion, okay neither does Trowa, but atleast Trowa's 
got a heart... I think.

Duo: I've got NOTHING against Duo, he's my second favorite character, but he 
gets on my nerves.. and A LOT even being my second fav. And he's ALWAYS 
talking to himself and has a weird smile on his face. I hate Hildi, there I 
said it.

Quatre: SISSY!! SISSY!! Come on, a guy who wears pink shirts? I know he's 
from the desert areas, but he doesn't have to wear pink. He gets SO on my 
nerves, in fact, I dubbed him Sir Whinesalot Winner, always moaning and 
being EVER so irratating. I hate him because he's ALWAYS yaoi paired with my 
Trowa!!

Wufei: Saving the worst for last.. I hate him because I always watch him and 
say "If he says 'woman' or starts talking about justice one more time....." 
You just want to pop him in the face! He's got to be Quatre's buddy for 
complaining.

***Sorry if any of them is YOUR favorite character, I'm just on a role now, 
THANKS TO YOU... thanks! I need something to do!***

Now let's see Trowa's influence in the episodes:

When Trowa first appears, he's already starting to kill. HeavyArms is the 
best Gundam because it has all those mecha weapons, and I'm a nut for guns 
^_^. When he meets Heero after he gets badly injured, he FINALLY laughs! He 
shows some signs of a normal personality. He keeps quiet unlike SOME 
annoying PLATINUM BlONDES and WOMEN HATING FREAKS...