- Hirsch won the annual bird-calling contest at his local high school, which earned him an appearance on the Late Show with David Letterman (1993).
- Has a twin sister named Ariel Hirsch and the relationship between the two inspired the relationship between Dipper and Mabel in Gravity Falls.
- Soos Ramírez is one of his favorite characters to voice.
- In a relationship with Dana Terrace.
- Is a fan of the Pokemon franchise.
- Is a fan of the sitcom Parks & Recreations, but not a fan of Chris Pratt.
- Is politically a democrat.
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