The world of the Teenage Mutant Ninja Turtles is a fantasy universe full of unique and colorful characters. The four protagonists, Leonardo, Michelangelo, Donatello and Raphael, are genetically mutated turtles who live in the sewers of New York City and fight against crime and threats that endanger the city.

In addition to the turtles, there are several other important characters in the series, such as the elderly master Splinter, their mentor and adoptive father, and April O'Neil, a reporter who often collaborates with the turtles. There are also numerous enemies, such as Shredder, their main antagonist, and his band of evil ninjas, the Foot Clan.

Additionally, there are several other supporting characters that appear in the series, such as Casey Jones, a masked vigilante who aids the Turtles in their fight against crime, and Leatherhead, a mutant crocodile who was initially an enemy but later becomes an ally of the Turtles.

Among the most popular TMNT toys and action figures are of course the turtles themselves, which come in many variations and versions, such as the classic turtles from the 90s or the newest versions of the animated series. There are also many action figures of enemy characters, such as Shredder and members of the Foot Clan, and many other secondary figures such as Casey Jones and Leatherhead. In addition, there are also vehicles and accessories, such as the Turtlemobile or the turtles' weapons, which can be purchased separately or together with the action figures of the characters.