Well for one, characterisation is how a writer chooses to reveal a characters personality in a story, through things like physical appearance (shiny hair, blue eyes, nice smile, ect.) and through virtues and faults (brave, attentive, smart - egotistical, bitter, evil.)
Figurative language is basically how you'd describe said chracterisations, through things like personification, hyperbole, metaphors, similes, ect.
So with that being said, figurative language can help characterise a monster by doing more than just saying it's a monster; figurative language can make it /feel/ like a monster to the reader. Figurative language can turn the monster '3-D' (for lack of better words), by saying it has long claws, stinky breath, vicious fangs, a horrifying growl, ect.
My favourite example of figurative language is actually in the childrens book "Where the Wild Things Are" by Maurice Sendak, because it uses simple figurative language. Maurice Sendak describes the wild things as so: "They roared their terrible roars and gnashed their terrible teeth and rolled their terrible eyes and showed their terrible claws.'
Hazel and Augustus meet at Support Group and bond over literature. They discuss poetry, books, and the meaning of life and death. Hazel has accepted her fate of early death, but worries how her parents will handle it. Gus fears he’ll die without accomplishing something great and leaving his mark on the world.
