[Varyon]

How about a Zodiacal Legislature? 12 bodies, each consisting of 12 members, for a total of 144. Each body corresponds to one of the Chinese Zodiac (or equivalent for your setting), each member must have been born under that sign to qualify, and the electors that appoint them can only vote for those of the same sign. Each term is 12 years (and all members of a given Zodiac are elected at the same time, during the year of said Zodiac), and members cannot be replaced, although removal via impeachment is possible, and if all members of a given body die or are otherwise removed, that Zodiac is simply no longer represented until its next election. Most bills/resolutions/etc must have a simple majority (typically seven) of the bodies vote in favor for it to pass, and voting in favor similarly requires a simple majority within that body. Constitutional Amendments and the like require a supermajority (75% or more, which typically calls for nine). Impeachment requires either a simple majority within the body the legislator is part of and a supermajority of all bodies or, if the body the legislator is part of votes against impeachment, all other bodies must vote in favor of it.

I suspect it wouldn't really work out. Having to deal with election campaigns every year, but each person only being able to vote once every 12 years (probably starting at age 24), seems like it would end... poorly.