Frank Jun Kim is the Dungeon Master in Heroes & Halfwits, Rooster Teeth's/Achievement Hunter's Dungeons & Dragons playthrough. His history with RT dates back to Red vs. Blue, where one of the fake endings of Episode 100 had him as a Japanese actor (he'd also voice a Blue soldier in season 6), and he's also appeared in Million Dollars, But... and the very first episode of Immersion.