In one sense, the least imaginative thing you can do with Hitler is just tell a straight, nonfictional account of his life-- such accounts are surprisingly rare in comics. Still, nonfictional comics Hitler did give a memorable, chilling first line to the Pulitzer Prize-winning graphic novel Maus: "The Jews are undoubtedly a race, but they are not human." They do say truth is stranger than fiction... but you may think twice after seeing some other entries on this list.
T Campbell has written quite a few online comics series and selected work for Marvel, Archie and Tokyopop. His longest-running works are Fans, Penny and Aggie-- and his current project with co-writer Phil Kahn, Guilded Age.