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.