Fighter 'Classes'

[Taneru]

What makes a heavy fighter?

What makes a light fighter?

What makes a very heavy fighter?

What aspects are important?

What elements do you think are vital to classifying a fighter as a specific class, or are there any?

This is a thread for personal opinions from everyone on the subject.
Hopefully, we can collect some information on how to better classify and develop ships in the future.

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Characters
Alan Markson: The Hellfire Legion's Lord Commander
The Perihelion: Freeport Four's guardian, and yet much more. Missing and assumed Lost with all hands.
Eric Dresmund: Junker, smuggler, thief. Last seen drunk on Beaumont
Vayrn Wyard: IMG Recon pilot turned Neo-Terran Captain. Last location unknown