 Welsh's novels share characters, giving the feel of a "shared universe" within his writing.For example, characters from "Trainspotting" make cameo appearances in "The Acid House", "Marabou Stork Nightmares", "Ecstasy", "Filth", and slightly larger appearances in "Glue", whose characters then appear in "Porno".Welsh is known for writing in his native Edinburgh Scots dialect.