Well, it could be a story that explores the themes of the unknown, friendship, and the power of facing one's fears in the presence of a ghost. But without reading it, it's hard to give a definite description.
Todo's appearances in the JJK manga are scattered. It depends on the specific storylines and conflicts. Sometimes he's in the foreground, and other times he makes cameos to add to the overall narrative.
I have no clear idea about 'hombre giando caricatura'. It could potentially be a name, a style of art, or something related to a particular culture, but without more context it's hard to say for sure.