A character who talks like a simile uses similes in their speech pattern the way a machine gun uses bullets: swiftly, mercilessly, and in quick succession, to the point where this quality becomes a prominent character trait. In a lot of these cases, the similes they use will be about as unusual as a school of fish in the Sahara and more complex than space shuttle wiring, but still the offender will churn them out as they talk, either in casual conversation or in the narration, as though coming up with them as they go along was as natural an act to them as picking on Acceptable Targets.