|This article is about a/an monster in Kaizoku Sentai Gokaiger.|
- "Don't think you can beat me that easily!"
- ―Reagaeru's final words before his initial defeat.[src]
- "AH HA HA HA HA HA! HA HA HA HA HA!"
- ―Reagaeru upon being enlarged.[src]
Regaeru is an Action Commander who is able to twist his arms to form a cannon to fire the Reversal Beam (逆転ビーム Gyakuten Bīmu) from his Gyakutentacles (ギャクテンタクル Gyakutentakuru) to switch opponents' bodies.
Regaeru was used in a scheme to switch the minds of various world leaders with Sugormin so it would ensure the nations unconditionally surrender to the Zangyack Empire. However, his plan is unintentionally revealed to the Gokaigers when he uses his ability on Doc and Luka and Gai recognizes one of his other targets.
The Gokaigers manage to stop Regaeru before he could start, and Gokai Green and Gokai Yellow take him out with their Gokai Scramble, returning them to their original bodies. Though enlarged by Insarn, Regaeru is easily outmatched by GokaiOh and GoZyuJin before being destroyed by Hurricane GokaiOh's Certain Kill Secret Technique: Turbulence Cherry Blossoms after it spun him into the air and GoZyuJin tossed him into the sky.
- Height - 196cm (Giant Form - 49.0m)
- Weight - 140kg (Giant Form - 350.0t)
- His motif is a squid and a clown and his design incorporates directional arrows.
- His name is derived from irekaeru (入れ替える, to change places).