Base Class vs Class in the linkage panel

I have 2 dozen movie clips in the libarary that are all the same structure, but with different content, and I wanted to write a single class that would work for all of them. Popping this in as the base class worked great until I wanted to pass in some arguments to the constructor. Suddenly, it seems I have to write a "shell" class for each asset that contains nothing but super(arg1,arg2) in its constructor (all 24 of them - ugh!). This ends up being really clunky. Is there any way around it?
Also - in discussing this with a colleague, an issue came up about the exact relationship between the items in the Class and Base Class fields in the linakge panel for a library asset. What exactly is therelationship? Does the class always extend the base class, or is there something else going on?

undo whatever you did that caused that problem.  you probably assigned a class name that matched one of your base classes.

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