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Steelbeak's predecessor was the #1 agent of F.O.W.L. until they disobeyed High Command one day. The nature of their disobedience is unknown, but in response, High Command had them pulverized by six trash compactors. Steelbeak, who may or may not have known them, became the new top agent and would keep his predecessor's fate in mind during his own career.
There is nothing known about what Steelbeak's predecessor looks like.