Post Random Legislatures here.

[Former President tack50]

Spanish Senate, if it was elected with the same rules as the US senate. 1 Senator per community, split into 3 classes elected at separate times (2016, 2014, 2012), FPTP.



People's Party (PP) - Majority leader: Soraya Sáenz de Santamaría (Madrid, 2014) - 45 seats (83.3%)
Spanish Socialist Workers' Party (PSOE) - Minority leader: Adriana Lastra (Asturias, 2014) - 3 seats (5.56%)
Podemos - Xavier Doménech (Catalonia, 2016) - 2 seats (3.7%)
Basque Nationalist Party (PNV) - Aitor Esteban (Basque Country, 2012) - 2 seats (3.7%)
Republican Left of Catalonia - Joan Tardá (Catalonia, 2014) - 1 seat (1.85%)
Independent (formerly CiU) - Josep Antoni Duran i Lleida (Catalonia, 2012) - 1 seat (1.85%)

A PP super majority, to the point where they could unilaterally rewrite the constitution. Obviously this is because of massive splits on the left while the right was unified, combined with the fact that 2012 was a massive landslide and 2016 saw the left exactly split 50-50.

To approximate the 3 classes, I took the 2016 general election, 2014 EU election and November 2011 general election. 

[Former President tack50]

Also some website had similar results for the standard Congress, so here is the Spanish "House of Representatives", with the same rules (based on the 2015 general election):



People's Party (PP) - Mariano Rajoy (Pontevedra North West) - 202 seats (57.7%)
Podemos - Pablo Iglesias (Madrid-Vallecas) - 70 seats (20%)
Spanish Socialist Workers Party (PSOE) -  Jose Juan Diaz Trillo (Huelva-Minas de Río Tinto)  - 47 seats (13.4%)
European Democratic Party of Catalonia (PDECat) - Carles Campuzano (Barelona-Sarriá) - 12 seats (3.4%)
Republican Left of Catalonia (ERC) - Gabriel Rufián (Girona-Alt Empordá) - 5 seats (1.43%)
Basque Nationalist Party (PNV) - Jokin Bidarratz (Guipúzcoa-Tolosa) - 8 seats (2.3%)

Well, this one is better but still not great, PP gets a very large majority with 28.7% of the vote. Also interestingly, Pablo Iglesias only barely wins his seat in Madrid and anyone relevant in PSOE loses his seat, had to pick a random backbencher as party leader.

[Former President tack50]

What if the Spanish Senate was elected by autonomous community instead of by province (4 by community, block voting in a 3-1 ratio), but keeping the appointed senators



EH Bildu: 1
Podemos: 17
ERC: 3
PSOE: 31
PDECat: 2
PNV: 2
CC: 1
Cs: 3
PP: 68

Total: 128

Still a PP majority, but narrower than now. 68/128 (53%) instead of the current 149/266 seats (56%). Those tiny provinces with low population but high representation help PP a bit.

[Former President tack50]

2 party-ish EU parliament, using the cube rule



Socialists & Democrats - 380 seats - Martin Schulz (Dortmund)
Euopean People's Party - 336 seats - Jean Claude Juncker (Luxembourg-at large)
Party of the European Left - 10 seats - Gabrielle Zimmer (Berlin East)
Alliance of Liberals and Democrats for Europe - 9 seats - Guy Verhofstadt (Flemish Bravant West)
Europe of Freedom and Direct Democracy - 7 seats - Nigel Farage (Thurrock)
Greens/European Free Alliance - 5 seats - *
European Conservatives and Reformists - 4 seats - Ryszard Legutko (Subcarpathia)

* G/EFA ran 2 leaders, both lost their seat. Ska Keller ran in Berlin Central. José Bové ran in Aveyron-Haute Loire. They eventually elected Ian Hudghton (Aberdeen) as party leader

[Former President tack50]

That’s a tiny majority for Schulz, right?

Yup. 376 for a majority. So a majority of 4 for the social democrats.

[Former President tack50]

FPTP Germany, based on 2017 (capped at 299 seats, 150 for a majority)



Alternative for Germany (Alexander Gauland - Saxon Switzerland-East Ore Mountain): 3
Christian Social Union in Bavaria (Horst Seehofer - Ingolstadt): 46
Christian Democratic Union (Angela Merkel - Vorpommern-Rügen – Vorpommern-Greifswald I): 185
Social Democratic Party (Martin Schulz - Aachen II): 59
The Greens (Cem Özdemir - Berlin-Friedrichshain-Kreuzberg - Prenzlauer Berg Ost): 1
The Left (Sahra Wagenknecht - Berlin Lichtenberg): 5

Result: CDU-CSU coalition majority of 81