Maybe this is the wrong place to ask, but are there any voting systems that allow arbitrary representation? A special case of this is the pure democracy, but mo

Maybe this is the wrong place to ask, but are there any voting systems that allow arbitrary representation? A special case of this is the pure democracy, but most people would likely let someone else vote on most issues for them. Then, on certain issues, you could choose to vote yourself or even change representatives. Also since your representative could be changed at any time, the waste that goes into campaign seasons and partisanship would be replaced with a more realtime focus on issues. Perhaps this is too big a change for the U.S., but it seems like we could try this out, i.e. on StackOverflow, Reddit, or Wikipedia before implementing new governments on Mars and beyond.