Teenage Mutant Ninja Heroes

Teenage Mutant Ninja Heroes is an AU/reboot version of Teenage Mutant Ninja Turtles. It stars all the characters of the series, including the ones from the TMNT summer short Teenage Mecha Ninja Turtles.

Teenage Mutant Ninja Heroes/Hamato-Sawyer Clan

 * Leonardo "Leo" Sawyer (voiced by Darren Criss): The Leader of the Ninja Heroes, and second-in-command of the Hamato-Sawyer Clan. He and his turtle brothers are quadruplets (him being the oldest), but he is younger than Basque and Frida, making him the third oldest member of the group. His theme color is blue. Leo is the most mature, disciplined and skilled. Calm, cool, and collected, he always attempts to help his brothers to be the best ninjas they can. Because of his leadership, he's often challenged with the constant rebellion of Jack. An expert swordsman, he wields two katanas and wears an ocean blue mask. He has a huge crush on April, who later becomes his love interest/girlfriend.
 * Donatello "Donnie" Sawyer (voiced by Bumper Robinson): The Brains of the Ninja Heroes. He is the second oldest of the Turtle quadruplets, but is the fourth oldest of the group. His theme color is purple. Donnie is the smartest and gentlest of the heroes. An intellectual, he often attempts to find an alternative way of reaching his goals. Using his intellect, he invents gadgets and vehicles. He is typically the passive turtle and Leonardo's second-in-command, playing the part of peacekeeper between him, Frida and Jack. Studying the art of Bojutsu, he wears a purple mask and wields an oak Bō.
 * Raphael "Raph" Sawyer (voiced by ): The Fighter of the Ninja Heroes. He is the second youngest of the Turtles, but is the fourth youngest of the group. His theme color is red. Raph is the most temperamental and physically strongest of the turtles. Rebellious, cynical and quick witted, he is often driven by his strong emotions. His quick temper tends to get the better of him, but he openly loves his siblings, parents, and allies. He wears a red mask and uses a pair of sai.
 * Michelangelo "Mikey" Sawyer (voiced by Greg Cipes): The Wildcard of the Ninja Heroes. He is the youngest of the Turtles, but is the third youngest of the group (being older than Jack and Frida). His theme color is orange. Mikey is the least disciplined and most fun-loving turtle. He is usually portrayed as the most agile and naturally gifted, contrasting his free spirit and inability to take training seriously. He often uses southern Californian surfer dialect and expresses his love of Pizza whenever brought up. He wears an orange mask and fights using nunchucks. Like in the TMNT 2012 series, his catchphrase is "Booyakasha!".
 * Frida Franklin (voiced by America Young): The Trickster of the Ninja Heroes. She is the (adoptive) older sister of the Turtles, as well as being the second oldest of the group. Her theme color is silver.
 * Jackson "Jack" Reilly (voiced by Eric Artell): The Lone Wolf of the Ninja Heroes. He is the (adoptive) younger brother of the Turtles, as well as being the second youngest of the group. His theme color is green. Before he was adopted and recruited into the team, Jack was a strict student of the Hamato-Sawyer Clan who wanted to become a powerful ninja, and he is close friends with Cody Jones as of Season Three onward.
 * Basil "Basque" Stone (voiced by Khary Payton): The Heart of the Ninja Heroes. He is the (adoptive) older brother of the Turtles, as well as being the oldest of the group. His theme color is indigo.
 * Kusama Lane (voiced by Tania Gunadi): The Ray of Sunshine of the Ninja Heroes. She is the (adoptive) younger sister of the Turtles, as well as the youngest of the group. Her theme color is pink.
 * Hamato Yoshi/Master Splinter Sawyer (voiced by Ken Jeong): One of the leaders of the Hamato-Sawyer Clan who is a Japanese man mutated into an anthropomorphic rat.
 * Chang-Hamato Akari/Master Angela Sawyer (voiced by ): One of the leaders of the Hamato-Sawyer Clan who is a Chinese woman mutated into an anthropomorphic nine-tailed fox, and Splinter's new wife after Tang Shen was killed by Shredder.
 * April O'Neil (voiced by Lea Michele): A Caucasian-American teenage reporter who is one of the main companions of the TMNH. She is Leo's love interest in the series.
 * Robyn O'Neil (voiced by Kat Graham): An African-American teenage prodigy who is the first human friend and ally of the Ninja Heroes. She is April's adoptive older sister. She was the first one to befriend the Ninja Turtles, and has already known them for 5 years before the beginning of the show and the turtles look to her as an older sister figure. April is a fun-loving and virtuous, if tomboyish, girl with glasses who is constantly looking for a job to support herself which constantly goes wrong. However, despite her bravado, she has a hard time making friends at school and is nervous about high school gatherings. When fighting, she also wields any blunt weaponry she can find, mostly a baseball bat. She is based on the incarnation of Robyn from the 2003 series and the incarnation of April from Rise of the TMNT.
 * Casey Jones (voiced by Josh Peck): The teenage son of a former NHL player at April and Robyn's school who Robyn is hired to tutor for an extra credit assignment. He is also known as a hockey-masked vigilante, armed with an assortment of sporting goods that he carries in a golf bag. He is a close ally of the Ninja Heroes. He has a crush on Buffy and a rivalry with Jack because of it. He's prone to recklessness but means well. He is a close brotherly figure to Raph due to both sharing an eagerness to fight.
 * Buffy Shellhammer (voiced by Amanda Leighton): April and Robyn's best friend and classmate from high school.
 * Venus de Milo (voiced by ):
 * Cody Jones (voiced by ): The future great-grandson of Casey and Buffy.
 * Starlee Hambrath (voiced by ):

Villains

 * Shredder (voiced by ): The main antagonist of the series, and leader of the Shredder Clan.
 * Krang (voiced by Mark Hamil): The other main antagonist of the series.

Trivia

 * This series shares some elements and inspirations from the 2003 series, the 2012 series, and the Rise of the Teenage Mutant Ninja Turtles series, as well as the TMNT summer shorts (especially Teenage Mecha Ninja Turtles).
 * In this series, Frida, Jackson, Basque and Kusama are half human half mutant with special mutant superpowers. They also have different theme colors, and slightly different personalities.