The following is an excerpt from New Mobile Suit Report Gundam W Setting Record Collection PART-I which came out in 1995 by Movic. On page 34, Shigeru Nakahara comments on his view of Trowa's character.
Shigeru Nakahara
My first impression of Trowa was that he was a very quiet character. I didn't have any particular difficulties in creating the role, but since he is the type of person who doesn't show his emotions very much, I wanted to convey the subtle changes in his psychology.
There are many scenes that have left a lasting impression on me, but today's recording (Quatre vs. Heero) featured Trowa's long monologue to Quatre, in which he expressed his feelings more honestly than ever before. It showed a new side of him, or perhaps this is his true self, but it was interesting to see, and I'm looking forward to seeing how the story unfolds from here. I hope you'll keep an eye on how these five characters, including Trowa, will move forward, and I'd be thrilled if you could join me in enjoying the expanding world of Gundam W. Please share your thoughts and feedback with me!