Well first of all I wouldn't just have one robots. I'd have many. Yup. Many little robotic friends scurrying about my household performing various tasks and then relaxing in reclining chairs when they finish.
*cough* Well, the first robot I'd have to get would of course be a replica of Zero. He would do the laundry, cook dinner, and answer any mail/PMs I get on Neopets/Subeta/PPT/e-mail doodah/etc.
Then I'd have a bunch of cute little robots who have giant heads, and they'd wobble about the house doing little things like cleaning, emptying kitty's litterbox, and all that jazz.
Though if we're only allowed to have one robot, I'd stick with Zero and have him do everything.
