Robot Cebolinha is a robotic Cebolinha doppelganger. He makes his only appearance in The Day I Defeated Mônica. His appearance mimics the original. The character is about twice as strong as Mônica is, as she found out the hard way when she tried to give him a Conejada, which failed as he deflected Sansão back at her with his hand alone and she could not dodge. The monster is Lawful Evil, taking Lemon Tree Street over and preparing to dunk his organic counterpart's best friend, Cascão, into the water, Cascão laments his fate, but Robot Mônica appears. Robot Cebolinha finds out the hard way that his opponent is FOUR times as strong as the original Mônica is. The two Mônicas and the organic Cebolinha send him flying into outer space, killing him.
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