- Sen (Promotional Arms Micron, 2013-11-09)
- A redeco of Dago, Sen transforms from a robotic octopus into a piledriver/quad-missile launcher based on Prime Rumble's weapon. As part of the Arms Micron gimmick, Sen features numerous 5mm peg-holes and pegs, allowing him to combine with other Microns to form bigger and more ridiculous "Combo Weapons" and "Super Combo Weapons". He is specifically meant to combine, however, with Ex, Geki, Shou, and Go to form the Gojōgōdenjin great sword, the Gojōgekidohō cannon, and the Gojōharyūtsui hammer. Sen comes out of the package as a bunch of unpainted parts on runners, like a model kit. Unlike the Arms Microns from the Japanese Prime toyline, he has a tampographed Autobot symbol on his Energon crystal, rather than a sticker beneath it.
- Sen was only available with the purchase of more than 3000 yen worth of Transformers: Go! toys at most AEON stores starting on November 9th.
- This mold was used to make Ink.
- While it's not made explicit that Sen is designed to go with Sensuimaru, we can infer that fact from his color (purple, like Sensuimaru), name ("Sen", from "Sensuimaru") and the fact that other Autobot Arms Microns from Transformers: Prime had names based off their primary users.
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