Robin Underwood is a citizen of the Kingdom of Knighton, and in his first year of training at the Knights' Academy. He and Ava like to tag along with the Nexo Knights on their missions.

Despite his young age, he was capable of operating a mecha and comes up with bright ideas, which was later beneficial to the knights. He was proven to be capable of assembling the mecha, in which even the knights alone were unable to figure it out.

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