Thunder Dolphin

Thunder Dolphin (サンダードルフィン) is AoCosta, the blue ranger of the Himitsurangers.

Origins
The Jettaroids were designed by Akira Shinmei, but was created by his son, Jefu, to create a new team of heroes, a spiritual successor to the "Cyborg Sentai".

She was assigned to Thunder Dolphin, a famous roller coaster located at Tokyo Dome City.

Rise of Southern Cross
When Jefu's nephews, Akira and Stella, came to visit him for the summer, the Southern Cross Army rose from the depths of the world to resurrect a demon of the past, Ocean Bride Cestria.

Eejanaika saw her as more of a tech on the battle field, the one with the ideas to defeat the cryptids.

However, even with her expertise, Cestria rose to power. Even though Akira and Stella had filled the void White Cyclone had left behind, He was reborn as Hakugei, just like the actual ride. With the ability to keep six rangers out (if need be), they could fulfill Eejanaika's gender reassignment.

However, after the reassignment, their is still footage of him back when the team "celebrated" Christmas in July. She would be remembered for her her crazy ideas on the battle field, even being shared with Stella, who would fullfil the same void of The Rovers.

Personality
Thunder Dolphin is the more feminine of the original Jettaroids (but Stella and Regina are more feminine). She is a good problem-solver and easily gains the slang of "the young bulls". Despite seeming to be "the kid" of the team, Takabisha and Acrobat (Hakugei, technically the youngest, but is a retracking of an older ride) are still younger roller coasters IRL.

AoCosta
Appearances: Track Dispatch, Transformation Lesson, Block 2-17, Block 1-Second Launch, Block 18-27, Unlucky 13, Block 28-47, VS Kagaranger, 48-51, VS Super Sentai, New Revolution
 * Ocean Rapier
 * Internal Transformer Himitsu Changer
 * Jet Souls
 * Blue Soul
 * Machine Dolphin Soul
 * Machine Dolphin
 * Machine Kujira (17-27)