Gorō Sakurai / Spade Ace
- The Leader: Up until Big One's debut.
- The Hero: After being demoted.
- I Love Nuclear Power
- Overshadowed by Awesome: While all the Jackers take a backseat to Big One following his introduction, Spade Ace suffers the most because of it (as he goes from being the leader to just another member of the team).
- Morph Weapon: Spade Arts
Ryū Higashi / Dia Jack
Karen Mizuki / Heart Queen
- But Not Too Foreign
- Catch Phrase: Do you want another?note
- The Chick
- Gratuitous English: She sometimes spouts English words or phrases like "don't shoot" or "wonderful".
- Improbable Weapon User: Heart Cute
- Selective Magnetism
- The Smart Girl: During the pre-Big One episodes.
- The Smurfette Principle
- You Killed My Father: Her motive for becoming a cyborg.
Bunta Daichi / Clover King
Sōkichi Banba / Big One
- The Dandy
- Fifth Jacker: The first Sentai warrior introduced in the middle of a show's run, years before it became a yearly tradition in the franchise with Kyoryu Sentai Zyuranger. But since the main team is composed of four members instead of five, he's not a literal sixth member. As such, he is the Trope Maker for Sentai, though Goranger provided the Ur-Example.
- Hiroshi Miyauchi
- The Leader: Replaces Gorō as this, thus making him the first non-Red Sentai leader.
- Master of Disguise
- Simple Staff: Big Baton
- The Smart Guy
- Spotlight-Stealing Squad: The original Jackers are reduced to supporting characters following his introduction. Even in later crossovers, such as Hyakujuu Sentai Gaoranger vs. Super Sentai and Kaizoku Sentai Gokaiger, it is Big One, rather than Spade Ace, who is often representing J.A.K.Q.
- To put it simply, Soukichi was Tommy Oliver before he existed. Interestingly, both were white rangers in their show's second season.
- The Strategist
Daisuke Kujirai / Joker
- The Mentor
- Put on a Bus: In the same episode Big One is introduced.
- Back for the Finale: In both, the actual final episode of the TV show and in the later JAKQ vs. Gorenger movie.
- A.I. Is a Crapshoot
- Big Bad
- Dark Is Evil: He gives orders to Iron Claw in the form of a black cloud with a small light emanating from it.
- The Man Behind the Curtain: His true form is a plastic ball filled with electronics. Even Iron Claw seems disappointed when he finds out.
- The Man Behind the Man: After 22 episodes with Iron Claw as the apparent leader of CRIME, Shine appears and quickly asserts himself as Iron Claw's superior.
- No One Sees the Boss: His true appearance is hidden behind a black cloud up until the final episode.
Boss Iron Claw
- Artificial Limbs: Has a robotic right hand.
- Bad Boss: See You Have Failed Me.
- Cyborg: Made more apparent by his Warrior Iron Claw form.
- Diabolical Mastermind
- The Dragon: Revealed to be one to Shine in episode 23.
- Final Boss
- One-Winged Angel: His Warrior Iron Claw form.
- You Have Failed Me: What he does to any Crime Bosses who fail to defeat JAKQ.