Michaelangelo is the craziest and perhaps the most childish in The Next Mutation. Mikey's the only Ninja Turtles who continued to like pizza. Besides being the wisecracking turtle, he also drives their jeep along the streets of New York, hosting his own pirate radio show, The Sewer Hour, through which he plays music and discusses with young people about their problems. He was also shown to have very odd eating habits, culminating in some food the other Turtles would rather reject (i.e. chicken feet, pouring soda on his cereal, etc.).
Michelangelo uses in this incarnation not nunchakus, but tonfas, with which he can handle exquisitely.
It is revealed in "Mutant Reflections", that Mikey thinks that Superman is better than Batman.
In "East Meets West, Part 1", Splinter mentions that Raph and the rest of the turtles are almost 18, and by the time of "Enemy of my Enemy", Raph mentions that he and the rest of the turtles are 18.