I've watched the anime and now read this part in the manga, this 3 Freeze ability still makes no sense to me. It's "freeze" (but actually makes things heavy) because he changed the spelling. Can he change the spelling to something other that "freeze" and get a different ability? Does it have to be an edited spelling of "three" to work, or can it change the spelling of other words for special effects to activate? Kind of like previous Acts worked, 1 is creating sound effects, and 2 is creating sound effects.
This Stand could be really interesting and creative (and a huge pain for translators), shame we don't see any other uses for it aside from "make things heavy".