Robocop - Part man, part machine, all cop.
Prime directives
- Serve the public trust
- Protect the innocent
- Uphold the law

Potato - Mostly carbohydrates, part protein, all root vegetable
Prime Directives
- Be a potato

Terminator - All machine, all killer
Prime Directives
- Terminate stuff in the most ruthlessly efficient way possible.

Call me crazy, but I think Cyberdyne's finest may have the edge here.