[Prostetnic Vogon Jeltz]

How about really high reproduction and colonization rates and call the race "Tribbles".

Should be very passive, shouldn't covet allies' planets etc.

Should be very hard to scrape off your shoes - i.e. glass all their planets in a system and next turn they've already re-colonized all of them, and 10 more in the next system.

Racial traits should include max reproduction & ship building & maybe min maintenance.

Could be a lot of fun.

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Resistence is futile.