Flecko is a fly who lives in Rocko's property. He wears a glass eye and is voiced by Tom Kenny. He has major roles in three episodes, "Day of the Flecko" in which he deprives Rocko of sleep, "Rocko's Happy Vermin" in which Rocko saves him and his insect brethren from being eaten by Ed Bighead, and "Fly Burgers" in which he files an initially successful (but fraudulent) lawsuit against Rocko.
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- He is one of the few characters not to appear in Rocko's Modern Life: Static Cling.