Leonardo (2012 TV series)

Leonardo is the de facto leader of the Teenage Mutant Ninja Turtles. At the start of the series, he doesn't really know how to be that guy and thinks that he's just a little bit better than his brothers. He is mostly serious, but he does have a perchance for joviality. He wields twin katana, indicated in the series as Niten Ryu.

Leonardo is voiced by Jason Biggs.

Personality
Leonardo is the most serious and focused of the team. Being the designated leader of the group, Leonardo is very enthusiastic about his role. He is also a big science-fiction fan. His favorite series is Space Heroes while his favorite character from the show is Captain Ryan. Leo has a habit of memorizing Captain Ryan's best lines from the show and repeating them during battle. Leo is so caught up with Space Heroes that he relies on Ryan's character traits more than on his own intuition which often causes his brothers (especially Raphael) to question his leadership.

For the most part, he tries to be the mature and responsible sibling, but there are times where he can be as childish as his brothers, such as teasing Donnie for losing to a mutant monkey, although Leonardo often tries to comfort his brothers when they are scared or upset, mostly Mikey. He comes up with most of the plans and strategies while he and his brothers are fighting bad-guys or training in their Lair.

Trivia

 * Niten Ryu is described as Leonardo's weapons, but it is in fact a fighting style, and not a weapon. A two-sword setup is properly known as a daisho. Niten Ryu, instead, is short for Niten-ichi Ryu (二天一流), a two-sword style developed by legendary samurai Miyamoto Musashi.
 * Leo seems to be the most educated (out of the four brothers) about Japanese culture and etiquette:
 * He understands Japanese when spoken to and is able to speak in this language to some extend
 * He knows, at least basics, of Japanese etiquette (i.e. he bows to master Splinter)
 * He uses chopsticks correctly and deftly
 * He uses chopsticks correctly and deftly