Leo is a 6-year-old boy, the Little Einsteins leader, and the one who pilots Rocket. He is Annie's big brother. Leo has red hair and green eyes.
His friends are Annie, Quincy, June, and Rocket. He also has other friends, but some are not human (for example one of his friends is a bumble bee from Africa.)
He made an appearance as a puppet in Disney Junior - Live on Stage! (back when the Little Einsteins segment was part of the show) located in Animation Courtyard at Disney's Hollywood Studios. Also, he made meet-and-greets with people, just like the other Little Einsteins, except Rocket.
- He is the only character on Little Einsteins to wear glasses.
- His skills with the baton include the ability to conduct animals (seen in Our
BigHuge Adventure, where he conducts cows and The Song of the Unicorn).
- His main talent is conducting and his most precious object is his conductor's baton; he never leaves home without it.
- Although he is only six years old, he is tall, in fact, he is taller than Quincy and his little sister Annie (she is the smallest). But June has his same height, but although she is tall she is small.
- It is hinted that he might have a crush on June. An example was in the episode "Ring Around the Planet". After Leo got Saturn's ring back home, June walked to him and gave him a big hug. (You can see Leo smiling because of the hug).
- In "Rocket's Firebird Rescue", Leo was granted Music Power and may have it permanently.
- In "A Galactic Goodnight", Leo says that he uses his baton as a nightlight every night, which helps him fall asleep.
- In the episode "A Christmas Wish" Leo's wish was a new baton head.
- He is the only character on Little Einsteins to have a full name release. His full name is Leonardo.