Monty Oum, the creator of the animated web series “RWBY” and director of animation for Rooster Teeth Productions, a company best known for repurposing the bloodthirsty avatars in the Halo video games into angst-ridden slackers in the popular web series “Red vs. Blue,” died on Sunday near his home in Austin, Tex. He was 33.

Mr. Oum fell into a coma after experiencing an allergic reaction during a medical procedure several days ago and never recovered, a statement on Rooster Teeth’s website said.

Mr. Oum, who often appeared in flashy costumes that made him look like an anime character, enjoyed surprising fame in a profession in which many remain anonymous. News of his death became a major trending topic on Google and Facebook.

Mr. Oum left a job as a game designer for Namco Bandai in 2009 to join Rooster Teeth, where he choreographed action sequences reminiscent of Ang Lee for the eighth, ninth and 10th seasons of “Red vs. Blue.” But instead of acrobatic actors, he directed legions of pixelated soldiers from Microsoft’s Halo games, versions of which are available for Xbox consoles.