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 is 15 years old. 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 15 years old. 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 Leo, Frida and Jack. Studying the art of Bojutsu, he wears a purple mask and wields an oak Bō.
 * Raphael "Raph" Sawyer (voiced by Robbie Daymond): The Fighter of the Ninja Heroes. He is 15 years old. 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 15 years old. He is the youngest of the Turtles, but is the third youngest of the group (being older than Jack and Kusama). 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. His new catchphrase is "Booyakabunga!" (a mixture of his two famous catchphrases Booyakasha and Cowabunga). His friendship/bromance with Basque is very similar to the one of Cyborg and Beast Boy from Teen Titans/Teen Titans Go.
 * Frida Franklin (voiced by America Young): The Trickster of the Ninja Heroes. He is 15 years old (almost 16). She is the (adoptive) older sister of the Turtles, as well as being the second oldest of the group. Her theme color is silver. Before Akari adopted her into the clan, Frida was a hacker that steals copies of video games for herself to earn some extra money since she and her then-decreased mother abandoned her toxic, abusive father.
 * Jackson "Jack" Reilly (voiced by Eric Artell): The Lone Wolf of the Ninja Heroes. He is 14 years old (almost 15). 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 by Akari 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.
 * Basque Stone (voiced by Khary Payton): The Heart of the Ninja Heroes. He is 16 years old. He is the (adoptive) older brother of the Turtles, as well as being the oldest of the group. His theme color is indigo. Basque was a student of Midtown High and a child prodigy who loves technology, math, economics and studying animal DNA before he was adopted into the clan by Akari.
 * Kusama Lane (voiced by Tania Gunadi): The Ray of Sunshine of the Ninja Heroes. He is 14 years old. She is the (adoptive) younger sister of the Turtles, as well as the youngest of the group. Her theme color is pink. She is the childhood friend of Frida and a famous gamer known as Ninja Gamer before she was adopted by Akari and recruited into the team.
 * 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.
 * Master Akari 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 childhood sweetheart and wife. She is based on Tang Shen.
 * April O'Neil (voiced by Lea Michele): A 15-year-old Caucasian-American teenage girl who is a confident, courageous, benevolent, intelligent, and outgoing human companion of the Ninja Heroes. She was a former lab assistant to the mad scientist Baxter Stockman. She met the Ninja Heroes when they saved her from a squadron of MOUSERS chasing her down the sewers. She embarked on many of the team's adventures and aids them by doing the work in public while the Ninja Heroes cannot. She is Leo's love interest in the series.
 * Robyn O'Neil (voiced by Kat Graham): A 16-year-old African-American teenage news reporter for Channel 6 News who is the first human friend and ally of the Ninja Heroes. She is April's older half-sister whose biological mother was decreased. 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 team looks to her as an older sister figure. April is a smart, friendly, intuitive, 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 incarnations of April and 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 and friend 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.