Reformulated Game: All three games were promoted as different versions of the same game.
Snub by Omission: Each game features a different Ninja Turtle as its cover character. Since no fourth version of the game was ever made, Michelangelo was left out. Curiously, Konami never thought of promoting Radical Rescue (the third Game Boy game) alongside the Tournament Fighters games, despite being releasing at the same time and having Michelangelo as the default character.
Unexpected Character: Some of the characters in the various rosters are relatively minor characters who managed to make it into the more well-known '87 cartoon (like Rat King and Chrome Dome,) and then there's a few characters (like War, Armaggon and Ray Fillet) who only appeared in the Archie comics, while Aska and Sisyphus are completely original characters. Basically if you were only a passing Turtles fan, most of the characters would be completely alien to you.
Evil Twin: The four turtles each have a doppelganger who serve as mini-bosses.
Guide Dang It: The desperation moves. There's only a vague hint in the manual stating they even exist, and to perform them, you need to use the taunt button, which serves no purpose otherwise and if you screw up the often-complicated motion, your character is now a sitting duck.
Perfect Play A.I.: The biggest complaint about the game. Even on the easiest difficulty, many say that the game is way too hard.
SNK Boss: Triceraton. His throw does around 60%-75% damage.
Tropes of the Super NES Version:
American Kirby Is Hardcore: The Turtles have deeper, gravelly voices in the American version. They go from sounding all like Don in the Japanese version and the arcades to sounding like Dean Winchester from Supernatural.
Bowdlerize: Aska wears a thong in the Japanese version and bloomers in the other releases. Her victory animation in the Japanese version also has her breasts jiggling while she raises her arm in victory, whereas in the overseas versions she uses the same animation pattern as Kunai Spin Attack.
Expy: In the pre-release builds of the game, Aska was originally named Mitsu, who was a supporting character in the third Turtles film, although the final version of the game treats her as an original character.