Final answer:
The main characters of the celebration during Las Fallas are called Ninots and are giant figures made of wood, plaster, and cardboard.
Step-by-step explanation:
The gigantic figures made of wood, plaster, and cardboard that are the main characters of the celebration during Las Fallas are known as Ninots. These figures are typically created and displayed during the week-long festival held in Valencia, Spain. Each year, different elaborate Ninots are created and showcased, and at the end of the festival, they are ceremonially burned as a symbolic act of renewal.