Choose a flat area where you want the couch
Place 3 blocks in a row for the seat
Add 2 blocks behind the middle and side seats for the backrest
Put slabs on top of the front row if you want a lower couch shape
Use stairs facing outward on the ends for armrests
Replace the middle seat block with a different material if you want a cushion look
Add carpets or banners on the front for a fabric style
Place signs or trapdoors on the sides for extra detail
Use matching blocks for a clean modern couch
Use colored wool, concrete, or terracotta for the couch body