Mr. Peabody is the smartest being in the world. He is the main protagonist of the film. He is voiced by Ty Burrell.
Mr. Peabody, as noted, is smarter than any living being on Earth. He is devoted to Sherman and has achomplished tons of things in life including inventing zumba, the fist bump, and winning the Nobel prize many times. He looks out for Sherman and does not want bad things to happen to him. In the show, Peabody was snobby and treated Sherman like a pet and an underling than a son.
Mr. Peabody is similar to Cornelius from Disney animated film "Meet the Robinsons". Both are a genius, both invented time machine, and both have spectacles. Also, they both have a boy who does something harmful to the universe.