An idea I've been toying with

[Unconditional Surrender Truman]

When I was running for At-Large Senate a few weeks back, I proposed a plan for a 7-member Senate:

The Senate would be the most changed of the three branches. Under the new system, there would be three classes of senators: Class A would consist of senators elected by the Regions, Class B would consist of senators elected per a district system, and Class C would consist of a single At-Large Senator who would serve as the chamber's ceremonial presiding officer much as the Vice President does now. In the event that the president leaves office before the end of his term, the Senator At-Large would assume the office of president. (NOTE: These changes include Regional Consolidation, so the number of Senators would actually decrease under this plan.) Senators would continue to serve four year terms, with elections for Class A held in presidential election months and elections for Classes B and C held two months afterwards.

This plan also abolished the vice presidency, vesting the powers of that office in the Senator At-Large.

[Unconditional Surrender Truman]

When I was running for At-Large Senate a few weeks back, I proposed a plan for a 7-member Senate:

The Senate would be the most changed of the three branches. Under the new system, there would be three classes of senators: Class A would consist of senators elected by the Regions, Class B would consist of senators elected per a district system, and Class C would consist of a single At-Large Senator who would serve as the chamber's ceremonial presiding officer much as the Vice President does now. In the event that the president leaves office before the end of his term, the Senator At-Large would assume the office of president. (NOTE: These changes include Regional Consolidation, so the number of Senators would actually decrease under this plan.) Senators would continue to serve four year terms, with elections for Class A held in presidential election months and elections for Classes B and C held two months afterwards.

This plan also abolished the vice presidency, vesting the powers of that office in the Senator At-Large.

i hope you meant four-month terms, not four-year terms

Yes.

[Unconditional Surrender Truman]

Why not retain the 5 regional senators, and simply reduce the number of at-large senators? What's the reason to have the same number of each?

I don't have a problem with this in theory, but I don't think Atlasia can sustain 5 active Regions right now.

[Unconditional Surrender Truman]

Why not retain the 5 regional senators, and simply reduce the number of at-large senators? What's the reason to have the same number of each?

To prevent one from out voting the other. Basically the equivalent of the divide in real life between State based Senate and proportional based House, but in a unicameral format.

I suppose that makes sense, but then again, if 4-5 regional Senators, each from different regions, can agree on something, it's probably not a bad bill. Would there be a scenario where all the regional senators agree on one thing, but all the At-Large senators don't? (My brain's struggling to find one, but maybe that's just me.)

Well, consolidation for one. Let's say, hypothetically, that a moderately popular three-Region map was introduced in the Senate. At-Large senators would have an incentive to support it, or at least would have no reason to oppose it: they rely on the approval of the national electorate and are unaffected by Regional boundaries. Regional senators, however, might be more hesitant: consolidation could potentially endanger their reelection prospects by throwing them into a Region whose voters are indifferent to them or loyal to another long-time representative. If Regional senators outnumber At-Large senators (say, in a 6-1 system like what you proposed), consolidation might very well be defeated by the interests of the Regional senators, even if the population at large supports it.