Status Alive
Age Mid 10's
Gender Male
First Seen Mutagen Stories #1
Relations Raphael - Brother

Michelangelo - Brother

Donatello - Brother

Splinter - Adoptive Father

Splinter is too old. The cops are simply limited. This city needs us, Raphael. If you don't want to work with us, you can leave right fucking now. Splinter picked me as your leader. Deal with it
— Leonardo to Raphael about leadership.

Leonardo is a main protagonist in Teenage Mutant Ninja Turtles. He is the assigned leader of the turtles, and serves as a role model for his brothers. However, they don't always stand him or follow his orders, turning every discussion into a power dilemma.


The turtles grew up together under the father figure that Splinter was to them. After being treated with Mutagen and turning into large, humanoid creatures, the master rat took them in as sons and taught them the ways of martial arts to fight crime in the streets. As Leonardo was the first turtle to properly develop, he was assigned as the leader of the four.

Killed VictimsEdit

  • A few Foot Clan ninjas.


Volume 1: What Pulls at Our Heart:

  • Issue 1
  • Issue 2
  • Issue 3
  • Issue 4
  • Issue 5
  • Issue 6


  • Leonardo's theme is Adolescent Genetically Altered Shinobi Terrapins by Brian Tyler.

Teenage Mutant Ninja Turtles Characters

Leonardo • Raphael • Donatello • Michelangelo

Supporting Characters April O'Neil • Casey Jones • Splinter • The Punk Frogs • Irma • The Newtralizer

The Shredder • Krang Prime • Rahzar • Tokka • Baxter Stockman • Rocksteady • Bebop • The Rat King • Slash • Tigerclaw • Pizza Face • Spider Bytez • Ray Fillet • Karai

Dead characters appear in italics