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Their allies
Nozomu Amachi
Nozomu Amachi | Actor: Sakuya Nakamura
- Deadpan Snarker: Mostly a nice guy but tends to have some dry remarks over the Goseigers' antics.
- Meaningful Name: Nozomu's family name, "Amachi", is written with the Kanji "Sky/Heaven" and "Know/Notice", a nod to his status as the Secret Keeper. Also applies to Professor Amachi through a different take due to being an astronomer.
- Only Sane Man: The only guy who keeps a straight mind and face amidst his friends' humour and eccentric tendencies.
- Secret-Keeper: The very first episode of the show has him eavesdrop on the Goseigers, learning more about their true identities. Hyde prepares to erase his memories of that event, but Alata stops him and tells the lad to not reveal anything to the general public. The little boy complies throughout the season.
Professor Amachi
Professor Shuichiro Amachi | Actor: Louis Yamada LIII
- Locked Out of the Loop: Subverted. He's known about the Goseigers all along
- Actually he only found out in Epic 43 When Master Head asked him permission to use his body. He was oblivious before then.
- Secret Secret-Keeper: As stated in Locked Out of the Loop, he already knows of the Goseigers and who Alata and his five friends are. However, they don't know that he knows.
- Ugly Guy, Hot Wife: Alata and Eri comment on this after looking at a picture of him with his wife (the viewers do not see this.)
Datas
Datas | Voice Actor: Kōki Miyata
- Killed Offscreen: The reason why he wasn't present in the crossover with Kaizoku Sentai Gokaiger was because he was destroyed during the Legendary War, and wasn't repaired in time. It's unknown if he was repaired later on or if he was Killed Off for Real.
- Mecha Expansion Pack: Compatible with the Hyper Change Headder.
- Can also combine with Gosei Great to form Hyper Gosei Great, or with the Mystic Runner (as another head) for Mystic Datas Hyper, a helicoptor-like flight mode.
- Multiform Balance: In his first giant battle, Hyper form was used for it's raw power, while his normal robot form was used for speed.
- Power Fist: Hyper fights with his boxing gloves, and combining with the Mystic Runner gives him Eggshell-Headder fists.
- Robot Buddy: The robot companion to the Goseigers.
- Super Mode: Datas Hyper
- Team Pet: The team's robot companion.
- Transforming Mecha: He can transform into the bigger Hyper Datas.
- Verbal Tic: ~desu!
