I've heard him described as looking like "a pointy Italian shoe that was turned into a real boy by a witches curse." I think that just about covers it.
I should say his casting in Ladybird was brilliant, because he's actually playing a high school d-bag. That's probably how the character was listed in the script.
@Lee Newman Don't know much about Dune, but I do know that Chalamet and Zendaya starring in a Dennis Villenueve film sounds like a 2020's Madlib.