Daisuke Namikawa
Waver is voiced by Daisuke Namikawa in all of his appearances in Japanese, with multiple actors reprising the role in English appearances. His design was created by Takashi Takeuchi as a young bishonen. The character was created by Urobuchi in an attempt to balance the cast of "Fate/Zero" with Waver displaying more weak traits as young man who would develop into a fine adult through the events of the narrative. His El-Melloi persona was written by Makoto Sanda as a grown man sharing detective dynamics with his assistant Gray inspired by Sherlock Holmes. Urobuchi expressed mixed feelings when Sanda handled his character but still felt it was well developed.