send me a ship and I’ll tell you who:
shops for groceries: Kanda does. He's a picky eater and he wants to make sure they always have the ingredients for soba.
kills the spiders: Aki. Kanda tends to just avoid them at all costs.
comes home drunk at 3am: On rare occasions, it's Aki, but Kanda is always with her to make sure she gets home okay. It rarely happens though. It often only happens if they are celebrating something.
makes breakfast: Kanda. He wakes up first and just goes to the kitchen to start cooking. Aki wakes up a bit later to food on the table.
remembers to feed the fish: Aki wanted the fish so Kanda makes sure she remembers.
decorates the apartment: Aki. Kanda doesn't do decorations.
initiates duets: Aki. She'll dance around him and sing and it will take a while, but eventually Kanda will start mumbling under his breath and spin Aki around.
falls asleep first: Aki. Kanda can't fall asleep unless he knows she's sleeping peacefully.