'''The Biomen'''

![[color:red:Gou Shiro/Red One]]

* AcePilot: Pilot of both Bio Jet 1 and the first Japanese space shuttle.
* FriendToAllLivingThings: With his SpeaksFluentAnimal powers.
* LawOfChromaticSuperiority: Shirou can understand animals, but nobody else is shown to have unmorphed powers. [[spoiler: He's also the only one to be directly linked to the Dr. Man part of the plot through his father.]]
* TheLeader: Of the Biomen.
* PlayingWithFire: [[FlamingSword Fire Sword]]

![[color:green:Takasugi Shingo/Green Two]]

* BadassDriver: Primary driver of the [[CoolCar Bio Turbo]].
%%* TheBigGuy:
* BlowYouAway: Hurricane Sword
%%* GeniusBruiser
* TheLancer: He is the NumberTwo after all, but he really cements himself in this position once Mika bites it.
* PrecisionGuidedBoomerang: ''Green Boomerang''
%%* TheSmartGuy

![[color:blue:Nanbara Ryuuta/Blue Three]]

* {{Delinquent}}: He used to be a delinquent in his teen years, but was inspired to change his ways. His first encounter with Prince reminded him of those times.
%%* FragileSpeedster
%%* KidAppealCharacter
* PunnyName: His Bioman codename is a pun on how the Japanese pronounce "Bruce Lee".
* ShockAndAwe: ''Elec Sword''
* TheSneakyGuy: His years of diving have made him very nimble and thus he is very skilled in stealth techniques.

![[color:gold:Koizumi Mika/Yellow Four I]]

* AntiHero: [[ClassicalAntiHero Type I]].
* FauxActionGirl: In her nine episodes, she doesn't do much fighting.
* ForgottenFallenFriend: No mention of her is made after her death.
%%* FourIsDeath:
* HeroicSacrifice
* KilledOffForReal
%%* RealLifeWritesThePlot: The main writer had plans for Mika that [[WhatCouldHaveBeen ultimately went unrealized]] after the actress left the series so early.
* ShockAndAwe: ''Thunder Sword''.
* TakingTheBullet
%%* TomboyAndGirlyGirl: Tomboy to Hikaru's Girly Girl. (Originally)
* WeHardlyKnewYe: Only appears unmorphed in the first six episodes.

![[color:gold:Yabuki Jun/Yellow Four II]]

* ActionGirl: Very much so, especially since her actress did her own stunts.
%%* TheBigGuy:
%%* LegacyCharacter
* MartialArtsHeadband: You don't ever see Jun without wearing one (and it fits [[TheBigGuy her role]] too). [[spoiler:Even one episode had this weaponized by the villains by replacing it with a time bomb!]]
* ShockAndAwe: Thunder Sword
%%* {{Shorttank}}
* TheStraightAndArrowPath: Is the only one of the Biomen to wield a physical weapon - a bow.
%%* TomboyAndGirlyGirl: Tomboy to Hikaru's Girly Girl. (Replacement)
* WhyDidItHaveToBeSnakes: Spiders.

![[color:fuchsia:Katsuragi Hikaru/Pink Five]]

* BarrierWarrior: ''Pink Barrier''.
%%* TheChick
* LaserBlade: ''Laser Sword''.
* TenderTears: She's the most emotional of the Biomen and tends to cry easily.
%%* TomboyAndGirlyGirl: Girly Girl to both Yellow Four's Tomboy.

* GenderFlip: Even though he's technically a sexless automaton, he addresses himself as a male in the Japanese original. In the English dub however, he was made female.
* RobotBuddy

!Bio Robo
* CombiningMecha: Composed of two jets (Bio Jet 1 and Bio Jet 2).
* HumongousMecha
* MechanicalLifeform: It is shown that Bio Robo has a will of its own when it runs away during Silva's first appearance.

'''Neo Gear Empire'''
!Doctor Man
* BigBad
* MorallyAmbiguousDoctorate: That 'Doctor' title certainly doesn't come from medical expertise.
%%* WasOnceAMan

* TheDragon

* EvilGenius
* MadScientist

* TheBrute
* ButtMonkey: Yeah...

'''Anti-Bio Union'''
!Bio Hunter Silva
* BigBad: He reappears as one of the main antagonists of Film/KamenRiderXSuperSentaiSuperHeroTaisen.
* BladeBelowTheShoulder: Both which can be fired like arrows.
* CatchPhrase: Hakai! Hakai! Hakai! (Destroy! Destroy! Destroy!)
* TheDreaded: He possesses Anti-Bio Particles that are more powerful than those used [[spoiler:to kill the first Yellow Four]] (Even though he doesn't manage to kill any Biomen with them). Peebo had a very good reason to fear him.
%%* EvilLaugh
* {{Expy}}: Based on Series/{{Kikaider}}'s nemesis Hakaider.
* HeroKiller:
* HumongousMecha: Pilots one.
* WildCard