I think a robot should have lots of tasks, but if I had to pick one it would have to be a robot nurse. I imagine a robot working in a hospital helping sick people and doctors. You could help save lives with this robot.
By ilovecake04
Other robots from Synthiam community

Jer361's Romni The Omnibot/Roomba Hack
This is my first build so it might take a while. Here is an overview of the project an Omnibot will be mated to a Roomba...

Justinratliff's Ez-Face
EZ-Face is the first in what I plan to develop into a suite of supporting application for ARC and other robotics...

Robotdude's Lieutenant Commander Data
Name: Data This is a full-scale replica of Data from Star-Trek that I have built to entertain the clients of ReStoring...