Otacon is the first combatant to be voiced by Brad Venable, and with the next one being Dan Hibiki.

Otacon is the second male to defeat a female, after Yoshi, and with the next seven being Dante, Roronoa Zoro, Shazam, Beerus, Billy Butcher, Franklin Delano Donut, and Shadow the Hedgehog.They are the first and second Konami characters to win, and with the next two being Raiden and Dracula Vlad Ţepeş.They are the first and second Metal Gear characters to appear, and with the next one being Raiden.Otacon and Solid Snake are the second and third Konami characters to appear, after White Bomberman, and with the next two being Raiden and Dracula Vlad Ţepeş.I'm impressed! Your security's pretty state of the art. Please tell me it's not a cardboard box.Until we know what you're up against, I suggest you keep yourself out of sight. I'll start scanning radio frequencies to see if I can find any comm lines, but Snake. If they're operating out here, it couldn't possibly be anyone we're familiar with.Maybe everyone's out for a late night dinner? Ok Snake, I've finished uploading the building schematics to your Solid Eye.Removed the AI controlling the Patriots' system.The two would then form a great comradery, with Otacon helping Snake during all of his major missions, and eventually overcoming the follies of his past. During development, he was led to believe that REX was actually a mobile defense system, but once he learned of REX's true purpose, the Sons of Big Boss captured Otacon and secluded him on Shadow Moses Island, where they forced him to continue work on Metal Gear REX under heavy guard, until he was later rescued by Solid Snake. After some obligatory childhood trauma, Hal went on to master in engineering and eventually became the chief engineer of the Metal Gear REX superweapon, operating under the codename 'Otacon'. Hal Emmerich grew up with his parents in an XOF research facility in Afghanistan, but was sent to America in fear of experimentation.

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