Little is known of Rainer Doyle, except that he is a Scrabble enthusiast, as well as an avid reader of the Mystery and True Crime genres. Like his character Winnie, Doyle is known in his community as an amateur sleuth. It is rumored that he solves local crimes using only newspaper articles, as he believes that reading obituaries yields effective results. Doyle’s crime-solving may or may not come with rewards.

Rainer makes his first appearance in Underdog Anthology 14, The Dark Ides of March.