Roderigo, though a minor character, plays a crucial role in Iago's plans. He represents the foolishness and gullibility that Iago preys upon, using Roderigo's infatuation with Desdemona to further his own agenda. Roderigo's willingness to follow Iago blindly underscores the theme of deception and betrayal, as he becomes complicit in Iago's schemes despite his own misgivings.