The Ranger Keys (レンジャーキー Renjā Kī?) are mysterious special items that were originally scattered across the cosmos until gathered by the Red Pirates. Eventually, after Basco's betrayal, Aka Red gives them to Marvelous to keep safe, learning later with his crew that they will enable to obtain the Greatest Treasure once the Ranger Keys' full power is revealed. Normally stored in Gokai Treasure Box (ゴーカイトレジャーボックス Gōkai Torejā Bokkusu?), the Ranger Keys are summoned through the Gokai Buckle by a thought-based teleportation system called the Key Road. When used with a Mobirates, the Ranger Keys fold to form keys which can allow the user to become a Gokaiger or access the powers of one of the previous 34 Sentai groups. By using it on the weapons it can activate a Final Wave (ファイナルウェーブ Fainaru Wēbu?) attack. By unlocking the greater power of the Legend Sentai's Ranger Keys, the Gokaigers can access forms of the previous Super Sentai teams' mecha that power up Gokaioh. In addition, the Gokaigers can access special powers as the Legend Sentai members. These include the magic spell Maagi Magi Go Gokai (マージ・マジ・ゴー・ゴーカイ Māji Maji Gō Gōkai?) as the Magirangers, which holds an enemy in place, the Gokai Kurumagic Attack (ゴーカイクルマジックアタック Gōkai Kurumajikku Atakku?) as the Carrangers, and the Shinken Six Continual Slash (シンケン六連斬り Shinken Rokuren Giri?) as the Shinkengers.
Aside from the five Gokaiger keys, the other Ranger Keys are not specific to any of the five Gokaigers. While the Gokaigers can primarily transform into a previous Super Sentai hero of their color, the Gokaigers can use a Ranger Key of any color. For example, in the events of episode 2 and the film Tensou Sentai Goseiger vs. Shinkenger: Epic on Ginmaku, each of the Gokaigers transforms into a different previous red hero. When their representative color is not on on the previous team, the Gokaiger can transform into the closest analog. For example, when the Gokaigers transform into the Gaorangers, Gokai Green transforms into Gao Black and Gokai Pink transforms into Gao White. If the gender of the original hero is different, the Gokaiger's transformed suit will match the style used by their gender (save for Sun Vulcan, which female style of suits had to be created due to lack of female members). For example, when Gokai Blue and Gokai Yellow transform into Magi Blue and Magi Yellow, respectively, in episodes 1 and 3, the Magi Blue suit is in the male Magiranger style and the Magi Yellow suit in the female style.
However, there are ten more Ranger Keys in Basco's possession, each representing warriors who are indirect members of the previous Super Sentai teams (ex. Signalman and Princess Shinken Red).
In Gokaiger Goseiger Super Sentai 199 Hero Great Battle, it is revealed that past Super Sentai warriors are able to regain their powers when they take their respective Ranger Keys into their possession. This occurs when the Goseigers steal their keys from the Gokaigers during the latter team's battle with the Zangyack Empire.
Kaizoku Sentai Gokaiger Ranger KeysEdit
Kaizoku Sentai Gokaiger Ranger Keys (海賊戦隊ゴーカイジャーレンジャーキー, Kaizoku Sentai Gōkaijā Renjā Kī): These keys are the main Ranger Keys used by the Gokaigers. They can also be used in GokaiOh to execute the Gokai Star Burst finisher.
- GokaiRed Key (ゴーカイレッドキー, GōkaiReddo Kī?): Captain Marvelous's personal Ranger Key that allows him to transform into GokaiRed.
- GokaiBlue Key (ゴーカイブルーキー, GōkaiBurū Kī?): Joe Gibken's personal Ranger Key that allows him to transform into GokaiBlue.
- GokaiYellow Key (ゴーカイイエローキー, GōkaiIerō Kī?): Luka Millfy's personal Ranger Key that allows her to transform into GokaiYellow.
- GokaiGreen Key (ゴーカイグリーンキー, GōkaiGurīn Kī?): Don Dogoier's personal Ranger Key that allows him to transform into GokaiGreen.
- GokaiPink Key (ゴーカイピンクキー, GōkaiPinku Kī?): Ahim de Famille's personal Ranger Key that allows her to transform into GokaiPink.
- GokaiSilver Key (ゴーカイシルバーキー, GokaiShirubā Kī): Gai Ikari's personal Ranger Key that allows him to transform into GokaiSilver.