Held back by awkward and uninspired musical numbers but otherwise a surprisingly funny and sweet animated comedy, Leo gets a lot of mileage out of being simply weirder than many of its direct-to-streaming contemporaries. As the titular lizard works through his cynicism by spending his last days helping others with their early years (a premise heartwarming enough to stand on its own), the film expresses itself through plenty of cutaway jokes and throwaway lines, excellent physical comedy, and a few particularly bizarre character designs. Everything is played in good fun though, and the movie's witty, easygoing personality allows it to overcome any limitations from its admittedly ordinary animation.

Many animated movies tend to talk down to kids or show some sort of contempt towards children, but Leo clearly has a big heart for them. All of the fifth grade characters are depicted as having complex feelings and insecurities, and all of their bad behavior is always seen as something that can be repaired with kindness. They also get the film's best musical number: "When I Was Ten," a humorous but sweet song in which they reminisce about being younger (AKA just a year ago). And yes, every time the kindergarten kids show up as flailing, unblinking, hyperactive creatures, it's always, always funny.