Dwarf refers to a person with one of several varieties of a specific genetic condition called dwarfism. A dwarf has disproportion of body parts. This is generally caused by a genetic or nutritional disability. Any adult human below the height of 4'10 (147 cm) is considered a dwarf.
One Piece has a great story and does not have a lot of filler episodes.
filler. n. 1. a person or thing that fills. 2. an object or substance used to add weight or size to something or to fill in a gap. 3. (Building) a paste, used for filling in cracks, holes, etc, in a surface before painting.