Liam Christopher O'Brien (born May 28, 1976 in Belleville, New Jersey, United States) is an American voice actor and voice director. He is married to fellow voice actress Amy Kincaid. O'Brien has voiced characters on animated TV shows such as Naruto (Gaara), Bleach (Captain Ukitake), and Code Geass and has voiced characters in video games such as Castlevania: Curse of Darkness, Castlevania: Lament of Innocence, Devil May Cry 4, Dirge of Cerberus: Final Fantasy VII, Lost Planet 2, The Last Remnant, and the voice of Illidan Stormrage in World of Warcraft, and has also voiced Kain Highwind and Caius Ballad from the Final Fantasy series (Kain in Dissidia 012 Duodecim : Final Fantasy, and Caius in Final Fantasy XIII-2)
- In an interview movie Liam O'Brien reveals that he has several dreams of the apocalypse a year, calling them "terrible, terrible nightmares".
- The voice O'Brien uses for War sounds exactly like the voices he uses for the characters Gaara from the Naruto series, Illidan from World of Warcraft and Caius Ballad and Kain Highwind from the Final Fantasy series. It is also similar to the character Asura in Asura's Wrath, but while War tends to talk in flat tones, Asura tends to yell.
- Liam O'Brien at the Internet Movie Database