“Jojo Rabbit” adapts the novel Caging Skies by Christine Leunens into a coming-of-age story that just happens to be set in the fading days of World War II Germany. There is where we meet Jojo (Roman Griffin Davis), a sweet German boy headed off to Nazi camp, where young men learn to throw grenades and young women learn the importance of having Aryan babies (an instructor played by Rebel Wilson brags about having 18 so far). He’s eager to join the Nazi party, tossing out “Heil Hitlers” with confidence when he’s not talking to his imaginary friend, Adolf Hitler himself, played with goofy energy by Waititi in a character not in the entirely-serious book. The writer/director portrays one of the most villainous people in history as a bumbling moron, always offering cigarettes to his 10-year-old buddy and suggesting very bad ideas.

Luckily, just around when the ‘Goofy Hitler’ schtick is getting tired, it recedes into the background for the most important plot of “Jojo Rabbit” when Jojo finds a Jew hiding in his attic, played by the wonderful Thomasin McKenzie (“Leave No Trace”). We know that it is Jojo’s mother (Scarlett Johansson), who is also working for the resistance, who has hidden the girl, but Jojo’s incredibly confused. After all, this Jew doesn’t look or act like a monster. He begins talking to her, trying to learn the truth about Jews so he can write a book, and forms a relationship that changes him. The parallel between the imaginary friend who is actually a monster and the girl he’s been told is a monster but is actually a friend is a nice one to unpack, and Waititi is careful not to push the arc’s melodrama too much. McKenzie is delightful and Johansson is sweet and tender—they both add much needed warmth to the film.

When one steps back from “Jojo Rabbit” and looks at the individual pieces, there’s a lot to admire. Once again, the director of “Boy” and “Hunt for the Wilderpeople” proves to have a gift with child actors, drawing a great performance from Davis and a nearly-movie-stealing Archie Yates as his pudgy buddy at Nazi camp. And a score by Michael Giacchino and cinematography by Mihai Malaimare Jr. (“The Master”) work together to accomplish that Anderson-esque atmosphere that Waititi was seeking. It’s clear that success has allowed Waititi to hire all the right people to execute his vision.