I was actually thinking of having people simply pick the attributes of their EVA, instead of rolling for it. (you're free to roll if you want to, of course)
For house rules, if it doesn't annoy everyone too much, I'd like to simply remove all the personal scale rules from Adeptus Evangelion, which leaves characters with just three characteristics: Combat Skill, Willpower, and Synch Ratio. (along with fate points and wounds)
As a further change, I would have advances tied to tech tier, instead of rank, increasing the number of available advances at any given time. The biggest theme based change I want, though, is to remove AT deflection from every class, since I want blocking attacks with an AT field to be a big deal, rather than something that any EVA can inherently do.
As for cities to start in, here are my ideas:
Tokyo-3 Of course, we could set the geofront in the same familiar setting, with the retractable city and such. This would be good for keeping people on the same page, but it does lack originality somewhat, and make it harder to tell a different story from the original series.
Shanghai-4 Shanghai was destroyed in World War 3, World War 4, and by the Chinese government for being too uppity. The city is a constant maze of construction, working desperately to rebuild itself yet again as Angels come to silence the Geofront. The central district of the city is the Forbidden City, a massive fortress built by the government to protect NERV, large sections of which resemble the Great Wall. Thanks to an extra MAGI supercomputer in the Forbidden City, technological research in the Shanghai geofront is faster.
Neo New York New York was miraculously spared destruction in the world wars caused by the Second Impact. ...Because the city had already been destroyed by tidal waves. New York now rests under 50 feet of water, but people still live in modular apartments built into the old skyscrapers of downtown New York City. The Geofront itself lies under manhattan island, which was spared from the tsunamis by epic levees which hold back the ocean, as well as border the lawless gotham district underneath New Manhattan Island. NERV commands a significant naval force in Neo New York from the World Trade Center, giving them greater anti-angel capability than usual.
Giza Built in the shadow of the Great Pyramids, the Giza Geofront HQ is less "Fortress City" and more giant refugee camp. The UN forces at the settlement couldn't keep the crowds of displaced from Africa and the Middle East out if they wanted to, so the grand Pyramid headquarters are surrounded by a massive tent city, sustained by the still fertile Nile river. Preventing massive loss of life during angel attacks in Giza will be almost impossible, but the desperate refugee population does offer a ready and eager labor force for any construction projects, enabling NERV to easily build in better defenses for the Geofront.
Babylon Despite its name, the Babylon geofront is located in the Italian alps, far away from any existing settlement. As a result, a consortium of the world's richest individuals paid untold trillions to carve a new Tower of Babel from the living rock of the alps, to act as a capstone to NERV HQ. Underneath the Tower of Babel lies the Metropolis, a massive underground city filled with the drone like laborers who built the Tower of Babel. Labor unrest is a common problem, and the Pope doesn't particularly approve of the apocalyptic imagery of the city, but it does provide an effective double layer of ablative armor for the geofront. The only weakness of Metropolis is the Heart Machine; a gigantic fusion reactor that runs the pumps keeping the Metropolis from flooding. If an Angel or terrorists were to destroy the Heart Machine, thousands would surely die in the resulting floods that might even inundate the Geofront.