The Obnoxious Rules Lawyer, which is also called a "Rule Shark", is particularly annoying because they believe that because they can find a rule about something, the people in charge , they can outmaneuver everyone and get what they want.
Besides being of any moral alignment at all, what all versions have in common is a nigh-encyclopedic knowledge of every single aspect of the rules of the system.
The difference between the three is largely down to attitude and how they use that knowledge.
They will attempt to employ every loophole, every odd circumstance, and every footnote they can.
Expect the Rule Shark to have pored over the rules — the rules.