The superlative form of Japanese is quite easy. Simply put ichiban (most) right before an adjective. For example, "takai"(tall) changes into "ichiban takai(the tallest). "Kirei"(beautiful) changes into "ichiban kirei"(the most beautiful).
Once I was teaching a priest from an Asian country. He was a very respectable person. To practice this superlative form, I asked him, "What is the most important thing to you?" I expected his response to be something profound. But his answer was...
"Oh! That's easy! My dictionary!!"
He also had the greatest sense of humor.