Jethro has the personality of a typical robot; that is to say, not much of one at all, as apparent by how all he can say is "I am Jethro." That said, he does show he has some personality traits hidden underneath, such as how he willingly assisted his siblings in escaping from Boxmore.
Like the rest of his siblings, Jethro was originally created by Lord Boxman to destroy the heroes protecting Gar's Bodega. However, much like his brother Darrell, Jethro would usually multiple duplicate units whenever he attacks.
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Mega-Jethro is a larger model of Jethro, though it has the same variety of weapons systems. This model is usually used for underwater expeditions alongside Getter Poseidon, as well as scouting more dangerous terrains.