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.
Wrinkle and line fillers first came onto the market in the Eighties and the original injections were called 'collagen', but this soon became the generic term for most fillers. The original injections were made up of protein from the connective tissue in cows.