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     April O'Neil 
https://static.tvtropes.org/pmwiki/pub/images/2071173_aprilfamily2.jpg
Voiced by: Veronica Taylor

April O'Neil is an ally and big sister/motherly-figure to the Teenage Mutant Ninja Turtles.


  • Adaptation Dye-Job: April's hair is now unnaturally red and given a purplish tone.
  • All Girls Want Bad Boys: April is shown to have an attraction to Casey Jones, though their contrasting personalities often make them bicker.
  • Badass Bookworm: A highly intelligent scientist and a certified Badass.
  • Bare Your Midriff: April initial outfit includes this, and is in fact apparently considered appropriate attire for her job as a lab assistant.
  • Battle Couple: With Casey, eventually.
  • Cool Big Sibling: April and Casey, who are 23 and 24, respectively, at the start of the series, are this to the teenaged turtles, who're supposed to 15 at the start of the series and about 18 or 19 at the end.
  • Hot Scientist: Just as in the Mirage comics, April started out as a 23-year-old science assistant to Dr. Baxter Stockman before he went openly evil.
  • Leitmotif: A quiet, low-key theme that generally plays when she’s in her antique shop.
  • Letting Her Hair Down: Inversion: If April's hair isn't in her trademark bun the situation generally isn't good.
  • Mission Control: This version of April makes much more use of her scientific expertise and she often uses her computer skills to aid the Turtles.
  • Ms. Fanservice: Thanks to her Bare Your Midriff outfit, and other outfits in the series including her jungle garb during "April's Artifact". However thanks to her Character Development, she becomes far more than just eye candy as the series moves on.
  • Ninja: In-training from Season 3 and onward when she starts getting lessons from Splinter.
  • Not So Above It All: Most notably in "April's Artifact" where she gets waaay into the Jungle Princess role and "The Christmas Aliens" where she sticks a spoon on her nose and grins stupidly.
  • Took a Level in Badass: In season 3, when Splinter teaches her martial arts.
  • Unfazed Everyman: After her intial scream and/or faint upon meeting the turtles, she becomes this.
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     Casey Jones 
https://static.tvtropes.org/pmwiki/pub/images/casey.jpg
Voiced by: Marc Thompson

Casey Jones is a hockey-masked vigilante who fights crime at night.


  • Adaptational Angst Upgrade: He was given a tragic backstory (See Dark and Troubled Past below) that his original Mirage comics counterpart lacked (it's especially jarring considering Eastman and Laird originally conceived him as someone who became a vigilante because he watched way too many "bad cop" shows instead of the usual "someone killed his family" origin). This backstory, however, was adapted in the comics later onwards.
  • Badass Normal: The only member of the team who has never had any mutant powers or abnormal origins in any continuity. Ninjitsu also doesn't rub off on him the way it does on April.
  • Bash Brothers: With Raph.
  • Battle Couple: With April.
  • Batter Up!: Often wields a bat as well as his signature hockey puck.
  • Berserk Button: He really hates the Purple Dragons. Especially their leader Hun.
  • The Berserker: Initially since he's the one to throw himself into a fight before anyone.
  • Big Damn Heroes: Gets to do this occasionally.
  • Boisterous Bruiser: Often on the frontline and loves it.
  • Brooklyn Rage: Has a Brooklyn accent and is easy to anger.
  • Catchphrase: It's revealed that the young turtles were teaching him all about martial arts and fighting (although they never found out) and each took turns to teach him what they knew. The cry comes from when Mikey was training him and told him to say "Gorogoro-sama!" (translation: Lord Thunder). But since Casey couldn't pronounce it correctly, he made his famous phrase Goongala!
  • Combat Pragmatist: Even the bad guys admit that Casey just plain fights dirty.
  • Cool Big Sibling: April and Casey, who are 23 and 24, respectively, at the start of the series, are this to the teenaged turtles, who're supposed to 15 at the start of the series and about 18 or 19 at the end.
  • Dark and Troubled Past: Casey's hatred of crime is rooted in this incarnation in his childhood. While Casey was still a kid, his father Arnold Casey Jones, Sr. refused to pay protection money to the Purple Dragons. His father's shop was burned down as a result, and a teenage Hun threatened Casey to tell his father to pay up next time. Despite being threatened not to, Casey's dad subsequently went to the police, but with no success; it's implied that the Purple Dragons later killed him for trying to turn them in.
  • Embarrassing First Name: Arnold. Casey is his middle name in this continuity.
  • Fire-Forged Friends: His friendship with Raphael consistently begins this way, and leads him to befriending the other turtles.
  • Good Is Not Nice: In his debut episode. He gets better though.
  • Heroes Want Redheads: Casey Jones with April O'Neil. The series even takes their relationship all the way as by the final season, they get married. April herself was much more of an obvious redhead than any previous incarnation as well.
  • Hot-Blooded: So much so that even Raphael has been disturbed by it on occasion.
  • Hunk: He is a tall, muscular and handsome man who almost always wears sleeveless clothes.
  • I Know Madden Kombat: Casey uses sports equipment as his main weapon.
  • Improbable Weapon User: Hockey sticks, baseball bats, golf clubs, croquet mallets, cricket bats...
    • The last being really amazing because you gotta know what a crumpet is to understand cricket!
  • Innocently Insensitive: Pairs with the No Social Skills below. He honestly doesn't realize he's being a jerk sometimes. He just says the first thing that comes to mind and gets confused when people, mostly April, get upset.
  • Jerk with a Heart of Gold: All versions have him being a jerk to at least one of the heroes, but they all still have a heart.
  • Leitmotif: An aggressive guitar riff matching his demeanor.
  • Mask Power: When going into action, Casey usually wears an old-style hockey mask.
  • No Social Skills: Due to his only focus being to get stronger and take down bad guys most of his life, he's not very well-versed in manners or even basic etiquette. A few of the first interactions with the turtle, and especially April, have him getting on everyone's nerves for never taking a hint or watching what he says.
  • Overshadowed by Awesome
  • Took a Level in Badass:
    • Casey undergoes a bit of this in Back to the Sewer when training under Master Khan (he manages to sneak attack and take down all four of the Turtles in this episode) but brainwashing is involved and the show doesn't give any strong indication of whether he retained his newfound fighting skills afterwards.
    • However, Casey still applies to this trope as it was revealed that when he was young, Casey lacked the confidence he shows as an adult, until the Turtles trained him to be assertive.
  • Vigilante Man: As he grew older, Casey became a vigilante and started hunting down crooks — particularly Purple Dragons — in the streets. until he meet Raph.
  • You Gotta Have Blue Hair: Technically, his hair is supposed to be black, but with the way the animation is, it sometimes looks more blue than black.

     Leatherhead 
https://static.tvtropes.org/pmwiki/pub/images/leatherhead.jpg
Voiced by: F.B. Owens (Season 2-3), Gary Lewis (Season 4-BTTS)

An ally to the turtles with a scientific mind like Donatello and is often referred to as "LH.".


  • Adaptational Intelligence: His past incarnations were never particularly bright, but this Leatherhead is easily the smartest incarnation of the character to date, rivaling Donatello's intellect (though he later confesses to being inferior to Donnie's smarts).
  • The Berserker: After being experimented on and tortured by Bishop, this side of him will come out and you better hope you're not aligned with the Shredder or Bishop in any way.
  • But Now I Must Go: He stays with the Turtles in early Season 3 following being freed from Bishop, but eventually decides that his temper is too volatile for him to continue living with them. He establishes a base in a nearby abandoned subway tunnel.
  • Emotional Bruiser: This version was quick to show off just how tender-hearted he is in addition to how tough he is.
  • Genius Bruiser: Here he is not only intelligent but also well versed in various technical and scientific fields and therefore the Turtles and their friends (including Professor Honeycutt) find not only his giant strength but also his great intelligent helpful.
  • Metamorphosis: From alligator to humanoid alligator everywhere else.
  • My God, What Have I Done?: Leatherhead says this almost word for word when he attacks Michelangelo in a fit of uncontrollable rage, leaving him unconscious and fearing him badly hurt/dead.
  • No-Holds-Barred Beatdown: In "Exodus, Part I", Leatherhead finally comes face to face with the Shredder. Enough said.
  • Sewer Gator: He was a pet alligator that was flushed into the sewers before he was mutated.
  • Sixth Ranger: To the Turtles. He's often called in as extra support in their battles against Shredder and Bishop.
  • Unexplained Recovery: Hun and Leatherhead both appear to fall to their doom in "Exodus, Part 1". They both appear later with no explanation of how they survived or what happened to them immediately after the episode. Granted, their fall was indoors and it is rather hard to determine how far they fell (and unlike the Gyoji, it is rather doubtful that the writers intended this to be their death).
  • What Happened to the Mouse?: He doesn't appear in Season 5, even with the threat of the Tengu Shredder and the fact that the Turtles summon almost every recurring character they can think of. He's later absent from all of Season 7 except the finale, despite the fact his technological savvy could've been of great use in recovering Splinter's data.
  • You Can't Go Home Again: Leatherhead initially yearns to rejoin the Utroms.

     Professor Honeycutt/The Fugitoid 
https://static.tvtropes.org/pmwiki/pub/images/fugitoid_returns.jpg
Voiced by: Pete Zarustica

A scientist whose mind was accidentally transferred into a robot's body, and is forced on the run by groups who would use his inventions for their own purposes.


  • Badass Bookworm: Becomes one as the series goes on.
  • Brain Uploading: The most commonly accepted explanation for his existence, although doubts are eventually raised as to whether this is the case.
  • Disney Death: He sacrifices himself to cripple the Triceraton and Federation forces in the "Space Invaders"/"Worlds Collide" arc, and is given a space burial, but later returns several episodes later into the season.
  • 11th-Hour Ranger: To the Turtles in late Season 3, assisting them in their final assault on the Shredder.
  • Heroic Sacrifice:
    • Pulls one in early Season 3 to cripple the war over his teleporter, but later returns alive and well.
    • At the end of Season 3, he agrees to join the Turtles and Splinter in their attempted Taking You with Me to Shredder.
  • Human Aliens: As Professor Honeycutt, he had the appearance of a human, but was not born on Earth.
  • Just a Machine: Although it's not true, he is considered this by The Federation.
  • The Professor: Obviously.
  • Put on a Bus: In early Season 2 he leaves to live with the Utroms. At the end of Season 3, he returns to them and isn't seen again until the series finale.
  • Stop Helping Me!: In Season 3 he's trying to surrender himself to the Triceratons now that he's wiped the data of his teleporter from his memory, and is annoyed that the Turtles are trying to save him from the warring aliens.
  • Took a Level in Badass: In the series finale, he's the very first of the Turtles' allies to leap into the fray against the Cyber Shredder's forces.
  • Undying Loyalty: To the Turtles.
    Honeycutt: I am with you until the end.

     Renet 
https://static.tvtropes.org/pmwiki/pub/images/renet_2003.jpg
Voiced by: Liza Jacqueline

An apprentice "Timestress" whose job it is to oversee and protect the timestream.


  • Character Development: She's largely much less of a whiny jerk in her second appearance, due to having gotten some experience with the Time Scepter.
  • The Ditz: Renet is shown to be quite a scatterbrained person who came to her friends with good intentions, but with little practical skill she caused some problems across space and time.
  • Forgotten Phlebotinum: She's completely and inexplicably absent from the Fast Forward season, where the Turtles are stuck in the future — because if she'd appeared she could instantly have fixed their predicament.
  • Most Common Superpower: She is notably endowed as well.
  • Nice Job Breaking It, Hero!: Already in her first appearance, Renet was sentenced to dusting in Lord Simultaneous library because she had accidentally reversed the evolution on a planet of giant worms, and got a six-week penalty. Quickly, she tried to use the Time Scepter to get though her sentence quickly. However, this played into the hands of Savanti Romero, who caused the arrival of the scepter with black magic.
  • The Load: Due to not knowing how the Time Scepter works, and not really having any combat prowess, she's largely useless in a fight. Even the Turtles grow exasperated with her in her first appearance.
  • Time Police: One in training, anyway.
  • True Blue Femininity: Her outfit is mostly blue and it matches her Innocent Blue Eyes.
  • Valley Girl: Her speech is this.

     Miyamoto Usagi 
https://static.tvtropes.org/pmwiki/pub/images/4729319_teenage_mutant_ninja_turtles_season_2_24_the_big_brawl_part_2_leonardo_vs_miyamoto_usagi_yojimbo_tmnt_2003.jpg
Voiced by: Jason Griffith

The guest-starring character from the comic Usagi Yojimbo.


  • Bash Brothers: With Leonardo. The two became very fast friends, and Usagi even goes to the point of calling Leo brother during "The Real World" parts one and two. It helps they have the same weapons and that Usagi's just a more cynical version of him.
  • Crossover: The characters and setting of Usagi Yojimbo show up more than once in the series, and "Across The Universe" features Raphael in one of Peter Laird's other stories, Planet Racers.
  • Early-Bird Cameo: He shows up in a flashback detailing how Drako tried to kill Splinter for defeating him, and helps Splinter.
  • Gratuitous Japanese: Often uses this.
  • Hero of Another Story: The Turtles go on adventures with him and sometimes even encounter a few of his friends and battle some of his enemies. And even though Usagi's world isn't explored too much in the series, it's pretty clear that Usagi keeps himself busy as the main hero of his own world filled to the brim with his own allies, his own rogues, and even more of his own adventures.
  • My Greatest Failure: Regards being Forced to Watch his master get killed in battle next to him as this.
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