- Has one son, Owen Kincaid O'Brien, with Amy Kincaid.
- Is of Irish-American descent.
- Is bilingual, as Miguel speaks only Spanish in Tekken Tag Tournament 2 and Tekken 7 at the moment.
- Voiced Eddie Dombrowski from Silent Hill 2 in Silent Hill HD Collection, replacing the original voice actor, David Schaufele.
- Voiced Rig in Dead or Alive 5/Ultimate.
- Voiced Kain Highwind in Final Fantasy IV and Caius Ballad in Final Fantasy XIII-2.
- Voiced Gaara in the Naruto anime series.
- Voiced War in the Darksiders game series.
- Voiced Gill in Street Fighter V.